Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f669baeaaa3dcca…

MALICIOUS

PDF

79.8 KB Created: 2021-07-15 23:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9302e6463699af59d841633f1c3b1cb8 SHA-1: edeb1aed617db5e8727eaa52ca49d90ef5f54893 SHA-256: 2f669baeaaa3dcca1615003068b44aab79a55661dfcb19a49e2a45e8a0d80a05
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_RANDOM_URL_LINK' indicate a pattern of creating numerous links to potentially malicious content. The 'SE_CLOUD_DOC_LURE' heuristic further supports the phishing pretext. The ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=online+ppt+to+pdf+converter PDF link annotation
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e27b9e7d5f---83265946704.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/wiropiwaporimos.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/cmd5evgnlifo8t5grasikciaav/jetemudokelonen.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/66711231270.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/9840dcbbf49a84980274a4e183b0766f/2256544534.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/20752799401.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/45211109596.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/kejovidirowuwugujesefem.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/pakejugakisadoximeruwuxu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef8f084aa---goserifagejig.pdfIn PDF document text
    • http://mp-journal.com/media/file/lupunepexusufegilujo.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/55429756766.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/dakazuwekutirarofekes.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/jisuwi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68c7d040b1---kuvowiwasikavotoj.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072839cbf34e---mewudusojil.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6fd5d8dc---78955910984.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/rozowije.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/pixun.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/db3f32b4869cbe477bf602ebc1f0a222/dimuvodasufovukavif.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/ramigobujifuxigalu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/29a797ddac885af140ed8a51ba803037/luwilifa.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qlqpbkmk97htd9cmigt19ldl7j/52360170247.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/nokuvuxaxivurodava.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 10372 bytes
SHA-256: 87d9b2dda3d3ea15ed35b689858d9446c159d6330c6defeb502146f26c34ccd0
font_01_sfnt_off0000ec01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC01 18144 bytes
SHA-256: 07700de4b2019648347f958bb1bf97d595b07374ef0bb454cd4411c696624910
font_02_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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