Malicious PDF — malware analysis report

Static analysis result for SHA-256 658addad00c24c63…

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 06:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f5bd4fe6f5cdbe94a7b3f61005ef099 SHA-1: 46ff0306520b3c09aac41af10b9950567e44b178 SHA-256: 658addad00c24c6319025623cd326ed3fccbf71841660c2a0693510895291b0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://clubchic.lv/c/i/files/14919295079.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16070d55fef806---75038535259.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/86bf8304dbce9d613e56031a3bdb23ad/33594825782.pdf
    • http://ajivikafinance.com/userfiles/file/24930092192.pdf
    • http://aquatrustfina.com/userfiles/file/82919029990.pdf
    • http://tc-antey.ru/uploads/files/vanajorupoza.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/mexogalifomobuv.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d10abe988---83596982540.pdf
    • http://acecaalcoy.com/userfiles/file/gavekiwuwozepetupo.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d53af3216ab31a7555fcb6f8ec2cb254/20788196635.pdf
    • http://aromaonly1.com/yamituki-n/uploads/files/zijojabeboriwi.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/0a6b297bf8415dd916153e08a4f77f1c/mukolinujes.pdf
    • https://bbpartner.cz/userfiles/file/beweb.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/772b457e9178a0209c1a5a4a25c1f295/2005248712.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1d82b7547c41ea8c2259b9ac3b057119/vuxilo.pdf
    • https://synersys.fr/contenu/file/14332817486.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2dac56cf9---padabupigofajisuzav.pdf
    • https://confetti-seasons.ru/upload/files/13186853051.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/c2bf3f0fdafa4dd1f472783c2e22ec5d/26277501473.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/130e3e453ef2f47820e9cf2edc5e2ae2/29567517164.pdf
    • https://nikoljski.com/ckfinder/userfiles/files/vixajulurup.pdf
    • http://ztkammer.at/uploads/file/zidulonigefunefedo.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c96f7bce4d4c7854e49756d83d56aaca/dubisuzozodujipowudadaro.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d91c93b0---67351441747.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/483688dfca2fedef39049e9d5a4fe823/69344084702.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ejaculation+meaning+in+biology
    • 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_off0000eb73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 16792 bytes
font_01_sfnt_off00010385.bin
ded39b6bf243924958a0d9eed6d84be09a1a7e819e10c1544df85de0d595d555
pdf-font-stream PDF embedded font (sfnt) at offset 0x10385 18812 bytes
font_02_sfnt_off00013371.bin
f934e88f56fe8f239c14cfc40ebcd3db383b51d937af557f5b83393bb3879ca7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13371 10772 bytes