Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a1b5e4a9f64d89…

MALICIOUS

PDF

67.8 KB Created: 2021-09-15 21:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f2c0b81f310c5710b744f5d399e49baf SHA-1: 31bfc26f59ebf83c7a9bac9c2770daf7fbe4cb59 SHA-256: f3a1b5e4a9f64d89f773639ad1d6d5c5592649b2a0a1578579bb3eeb3168d06a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7677

Heuristics 5

  • 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
  • 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://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/sc93flitsaphfmfh886t0139di/36449567170.pdf In PDF document text
    • https://minhgianggroup.vn/upload/files/45312369445.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/0f475dabb441e5e13f1111ed7254b970/43334315425.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/gemotosojem.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/15550337405.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/muruwazofukakeniwadinos.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/zejobaji.pdfIn PDF document text
    • http://tano-cable.com/d/files/rupesike.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/ruwonegosezusuda.pdfIn PDF document text
    • https://blokhol.com/upload/files/rixumilobafapipasedutuke.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/tosafezagitivadoto.pdfIn PDF document text
    • http://boldogelet.hu/media/11148421805.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9gtru180cd6m90gc9s5ostge00/kimekulavagowuzo.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/21157893808.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/67724759163.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/2697647054.pdfIn PDF document text
    • http://turatabor.hu/media/girapag.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390dd8511e2---tamigigitaxupowuno.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/81bcc76fffa68ee4e38f8613c8c1f3b5/xitumafujebedi.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/1662348591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=gun+strike+elite+killer+mod+apkPDF 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_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 10784 bytes
SHA-256: 3c5a6b100c5ccd2379a7b291ebf0774363d959d3e36687391c15e263a0d87757
font_01_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 21648 bytes
SHA-256: eb4d24798377fa94ebef650fb3e299031d298cd41d892ab86b6a41b159133678

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