Malicious PDF — malware analysis report

Static analysis result for SHA-256 91befe37d4cbf8c0…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 05:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a17cee5132a43884ccd64b8f5048fe15 SHA-1: d7dddaa2f864e2234de5fdbcf5de2c8356fed8f6 SHA-256: 91befe37d4cbf8c07efc3911bfcee20d6eca263759493fa5577e7ddcd51031f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'SE_CALLBACK_LURE' suggests a callback phishing or tech-support scam pattern. While no scripts were extracted, the presence of numerous external links and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://renault-service.com/userfiles/norurekazuledater.pdf In PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pojebigife.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd32fa1a99---26721183874.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/gesozusovetisedese.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/96837681694.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/17748742886.pdfIn PDF document text
    • http://parfumland.sk/upl/73481561627.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fifuzoxuwakadisukiwa.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/vikinorotemesatepewimox.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/gomedimexatifavisak.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0b10a827872fc0ae991196166f0e2b3c/4722470585.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cf524e9c20b08774d03a12b5b8b32b10/tolatatexigaxasinefuv.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/29492672440.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6ab2a1d5---tituluzawezesavotapu.pdfIn PDF document text
    • http://eva.am/files/08274bea97b65751.pdfIn PDF document text
    • http://edituj.cz/res/file/95712106592.pdfIn PDF document text
    • https://vietnam-pump.com/userfiles/file/bebukibav.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/wedizitoxuxekisosiputube.pdfIn PDF document text
    • https://clickbox.ro/images/file/6091052401.pdfIn PDF document text
    • http://anninh247.info/upload/files/vifuzibewilonavajunagaruw.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/xugosarukoxogefiro.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lubugumetufederemewisapo.pdfIn PDF document text
    • http://tabletopad.com/images/file/19752533015.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/jagitazo.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/tutaxasetujeso.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/warobajut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+patching+app+for+androidPDF 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_off0000b472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB472 15012 bytes
SHA-256: 11cadf866c5475f2591e7c8372cdd6a9d6582b1c14b9fe0a06dfa78954ff25f5
font_01_sfnt_off0000d9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D1 10904 bytes
SHA-256: fb0775357038bb787efd6fd179da867b8e597e171cb0ea7d94084489b373d9d4
font_02_sfnt_off0000f2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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