Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9e91e0f15342e1…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 20:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 175741ad5f2c4f97fc6e0d9abb771d89 SHA-1: 3071dfcef8373994fc47242797e4a2de807ec997 SHA-256: fa9e91e0f15342e1fa69abf1406f2eebecc8294860bba610b3d399b2298ce83b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. The document contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of a callback lure heuristic indicates the document likely prompts the user to call a phone number for a fraudulent purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bokaichenyu.com/upload/files/punenidowosowixebikuli.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/55c40vu3uhbb8ao1f57j98qomk/27241884143.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f741c0cdbeb09686df5e54a22e7e6740/80863764678.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/14986359614.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/mepavagugaponuremato.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/jelosomubenokuxuvisap.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/masexavatugatib.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/dugikivivunebovukugi.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/90462826666.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/41550300404.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/podalaw.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/resavijisafiputofoliwut.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/lukowofajiladumopa.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e015492829---bogujuzi.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/gorigolibeze.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109181459017018.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/653413364.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/niwenutogujexoruxit.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/89567236902.pdfIn PDF document text
    • http://sdds.be/userfiles/file/50378615981.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/66904911087.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/95307970656.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/93307662998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=custom+notification+android+appPDF 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_off0000b1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E3 15280 bytes
SHA-256: 1f8b746f1a9497992772cc4ee870cd1a5defa380c7a4a28e7cd938589319739f
font_02_sfnt_off0000f027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 10736 bytes
SHA-256: 3ae5ac69ec661e4f848edee1ed35bc354d8b7280ed8cd8fc307ee3f378becf63

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