Malicious PDF — malware analysis report

Static analysis result for SHA-256 0418f80f7f93cb9f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 10:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e2d274ef448f2e1afd502f2c1961417a SHA-1: f1f5752f1df94ce54fe41552f9b22a0d28f6d4a4 SHA-256: 0418f80f7f93cb9f47e0d11408cc3b2fe4447a8dc831ea5e5065b2a21a7f9b19
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of using compromised infrastructure for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://chcial.ru/uplcv?utm_term=the+man+god+has+for+you+book+pdf PDF link annotation
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/subiro.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/motega.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/13267278635.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/davurirusimuxinola.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/9ece566534175a647fe783dcdc2234a5/wikaritobuvitalolig.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607132e117879---fesuzikonalexenedib.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/venimagoxemupisapa.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/podetefijaxifitilavakazun.pdfIn PDF document text
    • http://air-con.ru/upload/files/10477883709.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210824_054621.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b46bfa1bb9---19044671452.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/40520785896.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/zumifenajaf.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/xejotemozaperazenotoja.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/t76plmknp3nb44aqvp7enr8rjp/vinasoluvusipuwuxad.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f73dc1fc6---pumamijuvemafuwel.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/ranufedinu.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/17001478988.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/parapevozal.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dab5a130---23585679853.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/pifugamidad.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/zefojavujuvarulix.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/1060015188.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 11116 bytes
SHA-256: eb9ace0f0657d2e274ad2d37745b3e999f3ad3f095f2a89e704a8271c1e5d925
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 17928 bytes
SHA-256: 1acc52a9842785d27126199d95f9742a0762c322adddcf3f15f17c889196e090
font_02_sfnt_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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