Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dbf99565324997…

MALICIOUS

PDF

81.3 KB Created: 2021-07-01 21:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc9e3cf24e6d6b571f593fdc8d6fa557 SHA-1: 5cbe348367b60a68cb30ce85e3efe5b6c6aba8e0 SHA-256: c6dbf99565324997385ad130fd48d6beea18ca8f2539cc4d3ef84a7ca2af2baa
156 Risk Score

Malware Insights

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

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs pointing to websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests the document is designed to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://hopkinshigh1961.com/clients/878968/File/kojanegejemela.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b267daacd---filijalezevofusitojal.pdf
    • https://ahreco.com/uploads/news_file/84821072898.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160718f577cd63---linusarimonapeduse.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/c39709b5f5f7e6c7fae4911542455851/18354839533.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/efba281cf602697d17c34267b4779435/kumoluvoja.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/99op278an3rpge52sq6ma14cr3/71637221910.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cc76e545---60904045352.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c575aea5733---72357478686.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/5c89b7106fbbf6bde3cd58879cac5e05/90461885946.pdf
    • http://turnyras.lt/Files/file/vapibefijumawobopuko.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/l7cnoigu9bjqlv1e8c8vfuf83i/71144363815.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/ac348f103401f97ba7252881c96fcc4c/nudujurovaweregu.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/79200c87ff52c9ce651b1af6d8afb932/xogajawuzevozoxetos.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ea060d1b---5332843352.pdf
    • https://trvstore.com/userfiles/file/kipojevelirolokarabojud.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/k7v1cla6ag4j0l6uhr595ahll2/sewamuxuzelanevinudugez.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/e553236d5f0d472949b0b8a758ff7c3a/2888632944.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095ff59498bd---vubulepawemaduzew.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089002c26a5e---bofizezarazobowojom.pdf
    • http://ledseoul.com/userData/board/file/16207005052.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99bac3b14c---79642868667.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/luqcinki6hqnskp20n2gt7tsad/4352530347.pdf
    • http://cuatro-pr.org/sites/default/files/file/vubof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=thompson+towers+inkster
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea74a0fef---nunapulir.pdf
    • 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_off0000d954.bin
58567a791cbc5558f899be77a41f27b233ab782c9fe7a79d5de24eca48796565
pdf-font-stream PDF embedded font (sfnt) at offset 0xD954 17776 bytes
font_01_sfnt_off000107ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 16792 bytes
font_02_sfnt_off00012016.bin
b6c3e4efb4a72871e192f4387e437cc1566ef31f662c9f65d8da477eb270db03
pdf-font-stream PDF embedded font (sfnt) at offset 0x12016 10448 bytes