Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc3b90cf374d0de…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 15:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea4761072e911a14b43d06f73a1b7e6b SHA-1: 5886fc84b5d8e91a4843610f127213b755146103 SHA-256: edc3b90cf374d0de86eba5d943f103c69f23438faf4614fb0fbb8a7729b73d5a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous links to potentially compromised WordPress uploads and disposable hosting suggests an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and link farm nature are indicative of common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://footstepfloor.com/upfiles/files/pojilokeworirutu.pdf In PDF document text
    • http://saraya-shop.ru/upload/files/36423883103.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/dilegonolubedumubosiw.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/takaregususogevixid.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133807749e88---gunufenuguz.pdfIn PDF document text
    • http://espwireless.net/uploads/file/lelobi.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/1543661815.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/tmqmqlr117j8vcud5ncu5i2pfq/24521073032.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/5403555707.pdfIn PDF document text
    • http://glassick.com/userfiles/file/67637848155.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/21198540327.pdfIn PDF document text
    • https://menokatea.in/ckfinder/userfiles/files/53255026763.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/n26bbv8bjtb0gqhf8ch12h2146/27004793976.pdfIn PDF document text
    • http://airzo.net/userData/board/file/xojoregevoj.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/21300955845.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210907122314.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/15893559149.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/viwamuzotumezubinokixiruj.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/muxosegilujupim.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/42238126745.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/80624228938.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2bf569c7---rugiw.pdfIn PDF document text
    • http://bakoca.hu/files/file/fobuvajijuwevalutuni.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/rikomo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39fe4979b---wovesexol.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/22667448770.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/zaluse.pdfIn PDF document text
    • http://philipsphotographystudio.com/51620338132.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=fortnite+free+download+for+mobile+phonePDF 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_off0000bba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA2 15940 bytes
SHA-256: 9867efb160bdc780a3d033f2ba60985674057f22ccbf4f1fe35c5cf74fcab7a1
font_01_sfnt_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 10800 bytes
SHA-256: c493b60c302c1eb10a08f70b51ed7786c96b01a15ac2c5b86b482a522ba2c846
font_02_sfnt_off0000fcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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