Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8a1f2f2dddf1ac…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 00:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b019ef2ba2d0fc7e05e3b695097d9aba SHA-1: fb6df6738fda6b9712d5e3adb27f036b7596fe33 SHA-256: 9e8a1f2f2dddf1aca545c5b5a5042faf609a949414f4fe13f12494ec533c2821
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 WordPress sites utilizing the 'formcraft' or 'super-forms' plugins, suggesting a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple distinct hosts and links per host, as identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic, further supports this. No scripts were extracted, but the structure itself is the attack vector.

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a039012bf70---60265374513.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/cre275qev7spqj4595lh89bqu1/burosowomurivisez.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/tubenipolu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160853e513ce53---43302059651.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabc05da12---pitawuxuwotafit.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qicu6ghlfqctdf68mka4h06nbs/xufugetavetenuvezowusami.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/623f065aed934f6977cef74e2b8aabb9/momugobejinovivoxowogiv.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/66913b5bf117a623ec266f9de484f9b9/29244678157.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a64eed2ff---63202071597.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/37183194610.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/74724383405.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdfd7c44bc---manudinedefabofiviwojowiz.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aba87a806b7---fajibola.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/81249147474.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/funotufubevubezawukej.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/zufuxoni.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/51228097423.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/bb08e6c804b2b93beae07382a6d9b14b/fafexuv.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609664efd8341---95939915217.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0421463001623620709.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gaxopejepemipifowo.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/pfifnas0d4ivhcn4uile9212q6/51484001926.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/gfve5vs8786ru5vo47cssm6hr4/wovudujuwanurirekuz.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607218b215fe4---43375040109.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/f40e86a615f69346c9a7e85ce36421d4/5778657136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=friends+and+family+barber+shopPDF link annotation
    • 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_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 17316 bytes
SHA-256: f18b1c7d0983db229a3f10a98ddc9e83a938886fbd680d841fa43b4285585397
font_01_sfnt_off0001283c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14053 10896 bytes
SHA-256: 40a43f792919685db07a46ead78b63009e44bc2b8ea00c8552e63e43585a18e6