Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0d4136536ed181…

MALICIOUS

PDF

83.0 KB Created: 2021-06-27 13:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 241c46c37ea59dcd27c2810a45435393 SHA-1: a76d74573b23463e53f22cbf10f1e39627eec3b0 SHA-256: fc0d4136536ed181f1310b7ffc3b5574c1afb035a39254594b93b813639394b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=military+pay+chart+2022
    • http://stroi-sistema.ru/img/wowujokadub.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d0dcf63888a7b4c279236047eba47074/dovimedesijonunubedux.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/65392986637.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/510cbc254368b83f8c154a4cd7a163b8/nedolu.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/74712359326.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6n4g91k6ndfnct6umcnsbos1j2/leboganurusuluwisiju.pdf
    • http://goodwill.pl/userfiles/file/35992394121.pdf
    • http://lycee-elm.org/userfiles/file/doretepamokofid.pdf
    • http://anhbanglaw.com/userfiles/file/dijikinevi.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/8293eb72aa4f9142d4c8c6a84c8e3eb9/30610362754.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h26jt3k7fif7akuodsm36dgj57/taxil.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sfhi3vq32pn11ij5c08h5dku82/59411438238.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/qjv089ghvdei7li0co06b1v4ni/dabemufakodelozixemapon.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/l38n6m6pp9ughg3t8tvb307c6g/tegurebiwe.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/sr84juioklg1ng2i8sk693p796/josowa.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073222d8d0e7---nafimepujefopekomebabuz.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/79420560947.pdf
    • http://babamoleskine.com/files/file/48713903468.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/93884c8e6000adbe044e55f465e3e595/12488101828.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/nvj4p9kuc9gsoqi60m7nsdsb7r/43567044826.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07fa735f41---36262657940.pdf
    • 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_off0000e45f.bin
b7acd52241fac70ce66f18ce205da3a2ac2d77c554c0077693d7985e7f8275b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 10296 bytes
font_01_sfnt_off0000fbbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBE 16792 bytes
font_02_sfnt_off000113d0.bin
9e26e446948041b1d7ba12737cf1b15c501f0ca4f5e46d229c1e70af393b70c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 16640 bytes