Malicious PDF — malware analysis report

Static analysis result for SHA-256 9028b0e3c82d7d11…

MALICIOUS

PDF

75.7 KB Created: 2021-07-02 18:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e22fe15b8ef6ed55e3cfcddceeb8d69d SHA-1: 46c6551f99b831cc9a02c395b321818d0c9fc9ae SHA-256: 9028b0e3c82d7d1135180f57585181061a5eec718824b372cbaa19574ddcb378
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites used for hosting PDF files. The primary purpose appears to be directing users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ea72338fff71ac5dfd345773deecc22e/40643227268.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/860ddfb1fab4390a0762017f847a1dee/31870362239.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae29a4ce751---29656817040.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607163e1d48f5---masetejiw.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4cda6a5101afe28daf153ee75c3b5551/kibiliwutidenegoli.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074370664771---73630547289.pdf
    • https://yuss.it/file/93817274524.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/99051702436.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c6294e899---60420892296.pdf
    • http://timandlor.com/userfiles/file/saruporezuxer.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a8f9e3b5f20a7454d3e711ac9623419f/13226042765.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb4f76400---rimed.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/699085759c641edeacdd87a80dd2fbe3/natejugafomilurap.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8d043bfea00d60c358f2e3f8446766c8/94993678807.pdf
    • http://akcjonariusz.com/UserFiles/file/mazawufo.pdf
    • http://fecirturizm.com/resimler/files/bofasos.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tah2v2ta6eaj8mbsju24jdv51s/nixefawataw.pdf
    • http://fitviewer.biz/files/file/72123506320.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c380a347431---74931313448.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607596a2e546a---49831216758.pdf
    • https://www.alapan.org/fckimages/file/kanotaduvuxaxoso.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9qn0nbsel7pjnahse15ersemva/pofukaxizofaniseropufeni.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16093baf08ad51---21758896205.pdf
    • https://fonixkoncert.hu/upload/file/93390206910.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convert+millimeters+to+centimeters
    • 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_off0000c846.bin
4b45df4e12ee4887d217990d34a04c4f92c9aad573b111724f5260c655410802
pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 16184 bytes
font_01_sfnt_off0000f20f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 16792 bytes
font_02_sfnt_off00010a26.bin
264c7e283a72cdecae6b798e47ea6500f22ac0c59f552d0ecddfffec4b6fc818
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 10328 bytes