Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d63ff0917093fcc…

MALICIOUS

PDF

96.0 KB Created: 2021-07-28 09:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d88517bc87bbda2738bcbca73e1de623 SHA-1: d02ebba426cff0022e2b6f601cf026339196837c SHA-256: 2d63ff0917093fccab22bca2f20f3854874157e6446d47e0b9443b2235d1ce19
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. The document's structure suggests it is a link farm hosted on compromised websites, likely intended to redirect users to malicious content or exploit kits. While no scripts were explicitly extracted, the PDF format can embed JavaScript, which is often used in such lures to initiate redirects or display deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868e98ccd8b---vifabisozopipef.pdf In PDF document text
    • http://cdmatik.com/uploads/file/bopis.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243f353f25---22246416924.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820dbd11413---33101465983.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/81230e0e48cd734b861fc62edfab1d6d/7507184818.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04b7cc8bbc---90360987550.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07241ae79e---poxigapudepade.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/33858073783.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/24846216210.pdfIn PDF document text
    • https://digireg.se/upload/41315190127.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/16584448360.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/71ea5cdc675258fbb56d150e4222dc74/16239142802.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/26597923257.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/surixijufevevabuxu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ba4afe352fbd098b417a7bdc9e251265/99323739896.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/01k4qoq5gldoi7gka5kpafffg5/nobikezofewerumitili.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0p0ri1ee9dccsnl27d2cqbv77a/7074698706.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/f3kk4250h48kfbtfutmo6l691d/80656943099.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096e878a4ab3---ritodumejevug.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a8aae6e7496f4fc67e4ac7645fa4c0a5/dunibajurijirefi.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/linidejolur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=riassunto+antropologia+culturale+robbins+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_off00010e31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12643 18632 bytes
SHA-256: af7b285b3c642898bd7e75f035e84ec4cc1ee51f7f26d4f93c187855c8142b2b
font_02_sfnt_off000155d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D6 11080 bytes
SHA-256: cbced1bcac0dcc6a629e87aa95e6fb2c3c61e5621aafeaf889b1e9bdb1476fba

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