Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae1395d31d6da0c…

MALICIOUS

PDF

84.8 KB Created: 2021-07-18 15:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fc4a754ad53cf5b962f5d003f3de20e SHA-1: 5a959cda922765871c5c75ecf9632859c9bb42ac SHA-256: 8ae1395d31d6da0cb9e670dbc2e1d495c26a82f07226ce3ffce6a400ccc1a503
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, exploiting users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5292d9b877---16193742248.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5u655bsftb9a35q0d5bq5993b5/94129450288.pdf
    • https://suprizpin.com/calisma2/files/uploads/derabemodesolova.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9mlu3krvbr516rts3efu1skh2f/73272417443.pdf
    • https://careersourceokaloosawalton.com/files/public/12999722020.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c67d0870d9769ccd58b94c24111d223d/desedobolukudo.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2533f4090---gavakudewujuzirirazosaw.pdf
    • https://tekartltd.com/upload/files/roxotasujixuvapimizabusus.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/159bae9fe2942439d19bfde923530c08/lejifelesuxurupekovew.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607562c4616de---54894868198.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a22d4503a---zepovofawasok.pdf
    • http://studiosantese.eu/userfiles/files/salafa.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f50186b84---20428657405.pdf
    • https://produktybhp.pl/pliki_user/File/56785376065.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0170bf9f---73934339348.pdf
    • http://myphamlulanjina.com/upload/files/lirofem.pdf
    • https://bem-sa.com/img/file/91496356139.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/20f2c7bfa8b3d2fb3a04ff8762233b33/lalumemov.pdf
    • https://ksboutlet.com/file/files/dovujagemoridutura.pdf
    • https://clubslotalmatriche.com/calcas/file/lunisokelimo.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d17129f3d7c54ed5858fa9dc2c4fe150/48493893820.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nro+account+meaning
    • 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
6a87fb5550aa77b260d3c28557da59de1fc37a3826121730f93e2bc36fbf9114
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 16612 bytes
font_01_sfnt_off000116a9.bin
0b646c2d0a3f53975e04ed5e761b81d605782afc102e35ec3941441da10b21e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A9 10436 bytes
font_02_sfnt_off00012e57.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E57 16792 bytes