Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c032fd0bd38c5b7…

MALICIOUS

PDF

62.3 KB Created: 2021-09-04 21:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81f13f56d5855cc5b86e09976492dc67 SHA-1: 311333283698829b04b5f592dc451320f2f69cea SHA-256: 9c032fd0bd38c5b7a9bb82072f4e7e88b34e3649437f657641a090c2a6fd3b7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This structure suggests the primary purpose is to lure users into downloading further malicious content, likely for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5680

Heuristics 5

  • 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
  • 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.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91be9af8f---rogareviga.pdf In PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/634ef52a90487a5f28a12642f06a1b76/lugalesijirunodejoxodewo.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/96836bfb6389c2593e97ab6c6b9a7707/6432344660.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a95e83906a7---lopalowexesirotabukideje.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2faca970---wigovixaz.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2c1c4906d50d219073d0b16715903850/82957958747.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/79498490504.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/gusokemekar.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7075a11403fe5df17580be161122684a/nobovupem.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9143e44e---joserebu.pdfIn PDF document text
    • http://nature-revive.org/files/file/najabekufuvo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kktbp6ln6e72t2tjpisp9hu98b/75702391005.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/52709966418.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/zofebove.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795cb39387f---9260067930.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/c8d3aad1cb98d853812c31985f34cc9c/nuxugotikufatazep.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/felotumuxobixefobef.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/pifanebapik.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/oe3qn667n9sgim826fo96l06d0/68825506397.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ac6d40e73348b4844b4007dbca5519d2/mopeg.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/36140007963.pdfIn PDF document text
    • https://atl-50.com/files/file/tagesijexadetarebuponoxa.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/zegilapijitoj.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/vepugaviwaxigamexibogawig.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/dogilim.pdfIn PDF document text
    • http://sjhtractor.com/d/files/zewogilifitanisomumetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=calle+13+latinoamerica+worksheetPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1