Malicious PDF — malware analysis report

Static analysis result for SHA-256 2586eaf48ba46176…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 02:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 806d03c7d01c9d7a0f43ccc07423d091 SHA-1: f64aee987fc7d52172332bac838696b53b2741df SHA-256: 2586eaf48ba461769c2f8e0da17260b2fee28a764d8c7432af130a9b967acd85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, suggesting it functions as a link farm to distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35bf31c761895b2e926875bd435c928d/25906591049.pdf In PDF document text
    • http://mateuszkucharski.pl/admin/file/26522626515.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/27cg00qdk81es8eiieog65da4m/85920067050.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/18655966683.pdfIn PDF document text
    • http://chromatographvials.com/d/files/95949122911.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/29125232248.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/83441316369.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af9df0b7441---vuvogajubezibim.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1414712935609269a8d524e.pdfIn PDF document text
    • http://cabini.it/userfiles/files/56603265442.pdfIn PDF document text
    • http://anjilh.com/uploadfile/file///2021050223080263.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/7874569006.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/potefofoz.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/10457183361.pdfIn PDF document text
    • https://epiphanych.com/images/file/dajajoxiji.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff053f5b0---77631673739.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/navotikewulu.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/bovozozopapugidekiji.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/81623786200.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/sasidogijejor.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c3db267fa2d---76353195177.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa70213610---zemexomeji.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/fosakulosunol.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/fajisudaf.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a7da5e3d32649b024b99aa8e5766f692/munixojininoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=schengen+visa+application+form+pdf+examplePDF 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_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 17844 bytes
SHA-256: dc30d1e15c9b08ca778dd0b4f0edc3a84be14d9bcbe5c34424d04c04636fbe05
font_01_sfnt_off000103e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E9 11308 bytes
SHA-256: 8453e627a8844e163f62443d2fa9d438a7b0ca0575d54a485000f8e96bf3af3a
font_02_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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