Malicious PDF — malware analysis report

Static analysis result for SHA-256 9906a027bd692625…

MALICIOUS

PDF

90.0 KB Created: 2021-07-15 21:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 90b4c42ab784ec241cfd482c8c8a6241 SHA-1: 57626d1a170491a9283c3245010f10172ff45d8b SHA-256: 9906a027bd692625821a706fb1943f19c576da3a2d258ff263cec47dd3a1abe5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/c46f0e84fb2587ca1af2bd96bf2c8d75/vipowifotaxexujalezan.pdf
    • http://dentherapia.hu/files/file/mesorobitivuzotud.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9fb13ddac---5224761847.pdf
    • http://asokmontridental.com/userfiles/file/majawole.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c38e8529d01---35881158960.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6157f64499---11443516427.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/00037f2c9959bdc23dfa3da624abc574/daxem.pdf
    • https://ijp2.com/contents//files/50839779445.pdf
    • http://clipsttm.com/userfiles/file///kukafewewaten.pdf
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/nejubasowesenul.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160917d8d59145---14375153374.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/icb41n6o112ie8rc15khqmerc1/rekalu.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b1350d5e6ffe86c96aa7ff8300913861/81302781770.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c71cb4d5d84---66588462916.pdf
    • http://4bx.pl/public/file/52645611393.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/43ad7d14a6a2c0614579506ecffafc63/36415994356.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/05982925e23736ae9760da9a6f2908a4/15827737339.pdf
    • http://ateliergermain.net/sites/default/files/file/mosipibezevusexojugewewi.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb3add3e64---komemad.pdf
    • http://sosnovgeo.ru/userfiles/file/8835168799.pdf
    • http://franzoesischebulldoggen.eu/userfiles/file/xogivunujusoxef.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8019e8e791---rulepe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=myeloma+cancer+causes
    • 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_off0000fec9.bin
ca956af5f24c469cab5f166aeca24a39bf0940d5ee53e5f802b9806231b4c21f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 17000 bytes
font_01_sfnt_off00012b2d.bin
3644777cd9adcb3608fe0709947ce3eb37c0d14b9fcde25868b8873747211568
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 10408 bytes
font_02_sfnt_off000142c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x142C8 16792 bytes