Malicious PDF — malware analysis report

Static analysis result for SHA-256 052c0d6e11fb13ad…

MALICIOUS

PDF

91.1 KB Created: 2021-07-26 21:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 028a0f4a4cd10901d4bc8d376c20f555 SHA-1: aaa3b31738f21aca0fc37f50b742997c7f4ebb9f SHA-256: 052c0d6e11fb13ad670d5349dc0be3c24a821b7b9b7bb9e513d3c01db1a9ebb5
172 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malware. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer, likely to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • 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 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94694cd22---22438604002.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/c8b4fa6b44905cae863acc02aa9725c5/muteladomatofa.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/tigafarokosirowaze.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/13225599474.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/74263c19ae6f88fa39899020480acaa2/35528046817.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160aa00a6246f2---588018137.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/68725814962.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/84582969576.pdfIn PDF document text
    • http://www.heksan.com.pl/file/newewovofipi.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/bobitakawakafefuz.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/99547884910.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/jegetogat.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489ab5e0fd---lifebon.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/88286264711.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/surir.pdfIn PDF document text
    • https://maturana.cl/upload/file/wamaxekefod.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/91398546484.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/vodotaxekamonarekunik.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/denufibalawerezexivagivu.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/42656210968.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48d76f410---luveti.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/turejelagoxikoxurezidig.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/d0b5199202f3fa0bd49d82e449c62ed2/98000570752.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=baishe+srabon+mobile+movie+downloadPDF link annotation
    • 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_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 10760 bytes
SHA-256: 54bbfe38f2363665cdf963f19bfa56014dc8db53ba9c9645cd171b512206a73b
font_01_sfnt_off00011a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13282 16748 bytes
SHA-256: bc6bf16dbdf84719cd57d517847eafc58ac50e89dbb66f544f3a75975d77df6d

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