Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8063906830cc77…

MALICIOUS

PDF

101.6 KB Created: 2021-08-09 00:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7664422fd21462fc529a4c5ca8064ebb SHA-1: 1bf02c2bd44cf8ec5605db80b53c5ba9fbb411d2 SHA-256: df8063906830cc771c4cf5134cd74abcd294d7011be61557bf3b2c23bd7ae317
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, prompting users to call a phone number under the guise of a support or billing issue. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://aashianarealty.com/file/46453677890.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/14e0d39d04216ae8dfe9f83120de5c1a/23755267665.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fab21fff1f70dfe794bae84fe95b5792/fapipezazuditeligosabaroj.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d517f7e732---11376507048.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/opb97vn83jcrad9k89hjo7nm1l/lunugomutisibazagidufe.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/931bebe057ca39e4176b67b93cfae4e5/87537412341.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/54827892440.pdfIn PDF document text
    • https://faceless.me/userfiles/files/32771004299.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/fipotumutusiritu.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/rogefasudinifofef.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/51036413583.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/kopirukadazizobijav.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/24a821cfbb1e331ed35c73aed18cdd5e/86509529922.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e56892dca2---nodopiwul.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/mekitofolarokidumovom.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a102054b5a3---54117086404.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/tiwodibukamidaza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec03db316b---797839064.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/1knn448fmirm8gn7479rna2lc8/77185575059.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae236b8c4e---61335557188.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/2e4e93a7dc585c07d4e50c1153422561/fabogowilabovananapewi.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/daperimuvomup.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/webena.pdfIn PDF document text
    • https://nada70.org/userfiles/file/33840369735.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210628200453.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/26153093356.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=automotive+mechanic+manual+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_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 10764 bytes
SHA-256: c0295ac454bda71a75cbb368380735f31155603e4f19ebb0a835470b99e8fca6
font_01_sfnt_off000140a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000158b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B5 17744 bytes
SHA-256: 5de3feaf160ce033fca422547781d70da6ed31e1f20130b3dd2e92829261a017

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