Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b57432f8e7add8…

MALICIOUS

PDF

95.0 KB Created: 2021-06-27 13:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0bef8da64566bf07c7e98c9dc4a79e8 SHA-1: 013cd10a296b0de178c362a67b12e5b3765b4cd7 SHA-256: d8b57432f8e7add8111f590ca510c5547cbb0acf0f25b5cf3b2e9f797226da65
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing scam, where the document likely prompts the user to call a number for a fake issue. While no scripts were explicitly extracted, the PDF structure and embedded URLs point to a link farm hosted on potentially compromised websites, which are often used to host malicious payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://dgaspcsm.ro/ckfinder/userfiles/files/gemefusukigog.pdf
    • http://boursemoi.fr/userfiles/file/59298888116.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/26913462671b69c41c8b7b266415eaf8/nifamufakilebup.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd1f741802---87063056548.pdf
    • https://giorgiosantinelli.it/file/197375966.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/237a25199bbd3d0bb4b46b64cb9d2949/ranajavufare.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/894d07b65821ab321a664add9be2a1bc/sexiv.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c695a24de87---vazojuxopuvimadobivazolem.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/q2i1e05icpe4rlgp0q1ibv3qbg/49092029974.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0d911bcb4---15789873166.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf0d21e5a---68706542250.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521162459237308.pdf
    • https://aawyx.com/sites/default/imageuser/file/72388226833.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/q9t2h4q58kcfii2geum97i9epd/44215587438.pdf
    • http://jrmhandling.nl/upload/file/xijinupo.pdf
    • http://tuzvedo.hu/elemek/file/tamunowigawag.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608228cf7ec0f---sumaxuzulaxur.pdf
    • https://addsfly.com/userfiles/file/64104082359.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/bddfe52f31fe3ab796ca0daba3503e74/difugim.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9qbtmns6l1r61fr4oquiqmf2q1/88152905492.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4df7da7506565fbfc433b987b72d2429/74494480808.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/306cda4vn48v0u92p024ab66gj/31100561912.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/2243307893.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160988b1b957a9---38561299483.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/baragorimipalafelane.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=example+interview+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fd2.bin
ae65e16b18a00835253846860f9bc2cadf538e851bc30361cebfd1e70493fc34
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 10532 bytes
font_01_sfnt_off000127cb.bin
85e4fc29b70447aa50b2908480d51a07461b8733de555d0b45b10fd5b7722383
pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 17932 bytes
font_02_sfnt_off000156a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x156A2 16792 bytes