Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b235458bf6ad14…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 14:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06537d18c8394fb99ff2347332dbe9d4 SHA-1: 4f4ece56205c980335958a3aa0dea82a94cece96 SHA-256: 28b235458bf6ad1441b0eee5f843e7f5c3f94607995ef5f97979a463f4a457ce
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous links to potentially compromised WordPress upload directories, suggesting it may be part of a larger phishing infrastructure. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the document's structure and embedded links point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/24b82a9cf49f4ababdd63a5232127a03/xubedekiwoboxekinawobib.pdf In PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/03181fbec4a3a2418f88663efe56e74b/82884141589.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/26260838097.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/40277541698.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/44667641137.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40cef5593a---mokenamadezepukifamekepa.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/f3c9bf53ca8b12f5678539a604054f3d/95202307884.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/25807085357.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c853df4682c---zomeb.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085045d2e2d0---90694476187.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/dajoratimujaxezulesidim.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tatewotixewenetesomigadip.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/86384963827.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607464ebc789e---natatovolisugipuruvoje.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bfc89c1e6---88448630352.pdfIn PDF document text
    • https://x-software.cz/data/file/ninasewitifazadop.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5ef8785ce7c0793534641167d2719c8e/16132659995.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cfbbd13b5---26918156392.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/loruzifalesubiwarewit.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b72a0206a826f2a7ac995aebf9c1cfe4/lisufabate.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/f305a0e113b3c08d9e2bd3126825efea/52768815492.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3afd57e32---48627824101.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/gelotipepi.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/porabiwevobiwevabajape.pdfIn PDF document text
    • http://netflor.pl/upload/File/34365294557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=manual+de+instalacion+gps+tracker+103PDF 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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 11220 bytes
SHA-256: 0ff9afdbf80d0b3c57fcf8f08833974e2f436d0a4da1c8ab681bd85ff05dfa24
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 18044 bytes
SHA-256: afc6d586dc808c2a104f27dbdfc8a12025cdee2561f1c2fa77312d47aea928cf
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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