Malicious PDF — malware analysis report

Static analysis result for SHA-256 123f105d3e59d5fc…

MALICIOUS

PDF

94.6 KB Created: 2021-08-06 00:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b105b30b28c33ea8a32167a4e67a96c SHA-1: 980eab34af9bae4d85739b395e4f895a5065f1b4 SHA-256: 123f105d3e59d5fc57bcb05b7689d79becdf4dc4a605bd2c3f6c476a0e5ad91b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

Heuristics 5

  • 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
  • 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://xn--80afc2apd5n.xn--j1amh/upload/files/peviliroguwosutif.pdf In PDF document text
    • http://becucci.it/userfiles/files/nixogubuwodefa.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/lutok.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/samodojusulilizilije.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772ded7545a---sizamewixadalezuxidamo.pdfIn PDF document text
    • https://soechi.net/userfiles/file/gupelewat.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a151d65505c143ecdc4ffa63e2f70f98/80843878078.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/mizudubefome.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8e1ab09de---bapozajojiwevawumefebivin.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/jazonoluwidepujuji.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/73174024368.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160726e257c039---63460745093.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/fa1f8b4b0176f3e62e30d2ad4edcc26e/dagereduduxin.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/21500781133ae23c8248d4b0b212bcf9/87511867957.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fibugelof.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/8onkd3029a05i591u5pbrfiqj3/bituvibabap.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/28978986812.pdfIn PDF document text
    • http://yulintimber.cn/d/files/dubomorotekomujuxonoba.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ev4pdl200vffgd0kh1slf5234k/mizis.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/6f3dpddof1miq4tqqn5uoegrg1/90522150398.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607df5223641b---pegemetevokul.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/88603962621.pdfIn PDF document text
    • http://millecolori.it/images/file/korudad.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/me9srr6n2s63d5n4btalaqvj4s/97961222729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=different+types+of+classroom+management+strategiesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 17596 bytes
SHA-256: 075f4a733b11f80c60cf6126a71edfea3017749f9ba70710a46ca5425523582b
font_01_sfnt_off000151fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1