Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8c1411191b8f76…

MALICIOUS

PDF

84.7 KB Created: 2021-08-11 16:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a9aac942d3703409c27796f5f4971aff SHA-1: 1c17948cb069ee1fa673a55cc82fb0a1f8b7b22d SHA-256: 1b8c1411191b8f7618d2dfd6d0268d8c3079bdcaa1d4b5a6eb1748b7571c10dc
164 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on potentially compromised websites. The presence of a 'download button' heuristic further suggests a lure to download additional malicious content. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608737027f49d---30144007383.pdf In PDF document text
    • http://willbramephotography.com/ribejemevavugedegikasuzu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c441a2e41---39786248085.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/lisatefixerenuvuzefo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/aad20722d1874d603e627df0fe4388f4/fufuba.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/24092336410.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/wexipuviw.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/69436346754.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080258ec2c48---64551587915.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160769a6f496d3---borozexesadezagajejenad.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/vokasorexasebarabu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608274f173b67---66282236271.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d96e9ede820cd7067ace7dd1d713387/51917807998.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/441a92f978890c3790d761bb46b5c054/kaworem.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a41cf16b957---67135842070.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/92208744046.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/jifuwavesetibiwamedi.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/bufesom.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323a40a489---22174296920.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kugajuxo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a808eafe0a---fuforuvijulesipedelusoj.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/782fe3847fc57a9dfa8a69d0f6b5b998/zivikinopudidaji.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/xowalaxepufot.pdfIn PDF document text
    • http://aozbt.com/clients/3/33/335f642cf73e2ad82edc7dd4a76dad4e/File/nojuwomajib.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b52cb5dd329905ed4bbcbf1687e0ae1f/20379791802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=figure+counting+reasoning+questions+pdfPDF 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_off0000e5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 10972 bytes
SHA-256: 0241271808c881e359cddec26a314c0160d7f05e02d7cb1d8a098a32ab75a21b
font_02_sfnt_off000116f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F7 17348 bytes
SHA-256: 6fb0c198e5ee3d4ce8e50cf3dab0506bea88674bb124a5b17db3a3ad369aad7a

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