Malicious PDF — malware analysis report

Static analysis result for SHA-256 251a9bcdadaf45b2…

MALICIOUS

PDF

97.5 KB Created: 2021-07-01 16:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 078129febd351764ca5db1d526201ed4 SHA-1: f635552560a7d3f30f17c0eae5982e8456a89708 SHA-256: 251a9bcdadaf45b2f3f3b7aeba0fb01995e513202f062a5f99aeb957f85667ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to other PDF files hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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.
  • 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://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160754e1327820---98314878014.pdf In PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/de15c36835f1dce0f5c6fc9ab4ce21ef/68264677286.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0eed11b8eefda98b9510a9fa2181fdd8/rigazisusatagawip.pdfIn PDF document text
    • https://tipresentoio.it/images/file/bizexufemi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebda8437bb---sugapamo.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/xividimozuwetakor.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c95ccd163---vapajaputitonib.pdfIn PDF document text
    • http://orem.mn/uploads/files/20414618132.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d0c178dbf397674b098a3fc741c13507/titutevez.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ef49caa7976a99600e67943e6fd1fa66/14386085863.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160da75099ad23---gedanujakani.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/49180564526.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d50fd9a25a---ramuloroteli.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e80aeobbt938kvbm71unn0lkl1/34782649652.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c944e31e66---fibuwimupejizomumofo.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/jopomir.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6ce0d6e4675a1e74c4f11e50944c4cb7/26252078835.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e1d21150e---63648264497.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/dc08d286cad3b1e4a6877db6eeaf9c09/37207674099.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///xupisolisuzefejezo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021052509124897849.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/69870467463.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/bawalelunabatiraza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=different+drinks+in+spanishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10188 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 18432 bytes
SHA-256: 41c6a4c380c53d6151f780700327fe31ec9d837e922530b4ce2de7481691f286
font_02_sfnt_off0001490d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490D 16644 bytes
SHA-256: 6285df5d0061988c9e958a65e487f934efead77a622c7d196ed9c6e3e4c03ce8
font_03_sfnt_off0001609b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1609B 10520 bytes
SHA-256: 33654669a9fae0b4cad6e4fb801b354f3f370cf3ec27bae6e4910704580b497c

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