Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89ef1a6897ad35a…

MALICIOUS

PDF

86.0 KB Created: 2021-07-17 06:57:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13bfde336ccd45f3e03e44888b36cc03 SHA-1: 368e04697e270f92d6de6fe0857a5b768bf38895 SHA-256: a89ef1a6897ad35aed248bd2fa1b945c8d8696c08cd3a8de704051ae7b9738b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/72205085928.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/59967801867.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ae941302b---jilinakosot.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0a0d6ae1---86359992209.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/8f98e46f6a551e4a8a646c6ca52b604e/1836586224.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/5ucr77sdjb9oaa2a6ggtn7ur1l/sesavege.pdf
    • http://rajskiewakacje.pl/userfiles/file/44255523155.pdf
    • http://kojeneckezbozi.eu/userfiles/file/59990319386.pdf
    • http://4bx.pl/public/file/wajupexuboravazifakexowes.pdf
    • http://3dsami.org/uploadfilefiles/7285600338.pdf
    • http://aklond.com/UploadFilesfile///2021050519195622.pdf
    • http://minutemen-jrotc.com/clients/84940/File/gesudobexuxopilu.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/424gghmcmmtp5eqhuls97o0tu4/zojej.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160da4167e3e9e---ketaveze.pdf
    • http://chandigarhdatarecovery.com/files/file/68443853291.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e01523b154---36085202521.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c05f6aed7---5640620592.pdf
    • http://progfin.pl/userfiles/file/xivuwodoxivo.pdf
    • http://delve-cr.com/uploads/28928315999.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074003ad5890---55844528887.pdf
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/263f18cedda6b383440600f3622d348d/94743334716.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af95a96db8---62848739011.pdf
    • http://lagrupacio.cat/file/zawojovum.pdf
    • http://cheers-gifts.com/userfiles/2593640195.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=compare+and+contrast+formative+and+summative+assessment
    • 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_off0000edf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16792 bytes
font_01_sfnt_off00010608.bin
4437465d29a1a5e8c233e220838b5eabbbdb1529e0321cad32b3934e618eb76b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 10932 bytes
font_02_sfnt_off00011f66.bin
e01036a7795ca01ddccb1c5bd4eb0cf206eb9b8be8e5b92a63b517944e0f1ac9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 16548 bytes