Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2797f6237c7ff71…

MALICIOUS

PDF

86.7 KB Created: 2021-07-06 00:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5da0dc99bc7a83dd437ae908701343a8 SHA-1: 5e502c167d7b70bb7fa65d2485be5bf7498a671f SHA-256: f2797f6237c7ff713252f198b5f10cdfa2e0e7bc7b24380587ed99685f256c7a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The file's structure as a link farm on disposable or compromised hosting reinforces its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/90e7e9e055cd36f05ed0bdde4ad134eb/matibakam.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e009b8219d---xupamusejiwiparu.pdf
    • http://sosnovgeo.ru/userfiles/file/fawomax.pdf
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/fesezuresasemizugomodebep.pdf
    • http://aligokdemir.com/resimler/files/kiwepozemulo.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f608867c173ca13c773b73953b86fa5c/welarusidipizazujifulisun.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/dudag.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/zejepalowolerixadi.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc26bcf5f5---33713505114.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5be91caca---vilesutojovanixutuvap.pdf
    • http://tcihk.com/userfiles/judutum.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd26680b46a---89310901804.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd2bb0979d---gufuzajipajizonero.pdf
    • http://jucal.es/images/file/27076678342.pdf
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/21127886623.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4997a9c92032ca3dd3e5c0fafa814406/26582054556.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/lonozokepujebixubar.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5fa4555dc---vipijobulu.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210613180453.pdf
    • http://tubietelbar.hu/uploadfile/funorapux.pdf
    • http://morgancountyoh.com/userimages/posodubipiz.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/c9fc75250b262cac5b3af835519a1479/8305676312.pdf
    • https://digireg.lu/upload/fibawegekivekamorawaze.pdf
    • http://asupuro.com/user_data/image//file/94231666622.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1580cb243---75913292976.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hand+compartments+anatomy
    • https://medlineplus.gov/anatomy.html
    • 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_off0000f28c.bin
29f5c574dae186799ba91524349393a74c1e18170989762234d5f310c8e16b42
pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 16428 bytes
font_01_sfnt_off00011d31.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 16792 bytes
font_02_sfnt_off00013548.bin
611188af89603c2500deb7e7818213f0761ff496544a054b86a5a77583540831
pdf-font-stream PDF embedded font (sfnt) at offset 0x13548 10640 bytes