Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70f6b6a5e89ae89…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 22:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd7c41dd83f10408df210a21996a1a5a SHA-1: 6aa5dd3460aa0b5dc4e69d6c1521be9af6e21c49 SHA-256: b70f6b6a5e89ae89604eeb62f652162398b6db38de9921a65966a4a7cf12445c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pr-jam.com/ckfinder/userfiles/files/vapolojamojawepap.pdf In PDF document text
    • http://trip-sale.ru/userfiles/file/56066290311.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/bolofifotuwogoz.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/75356613164.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/13586314915.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipanifidibar.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/rulazuretaveritadunepe.pdfIn PDF document text
    • http://safetruck.gr/images/file/megamigezasef.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/q7ouj6dmmvqstovdjaqbrqf2l7/38812283340.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a4f90e994---lusaru.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/remaruwuw.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161374976233c0---zurozagugarofamibosegetuk.pdfIn PDF document text
    • http://nineslash.com/user_file/file/2332860515.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613148736ca7e---vusavejafate.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/wisukivebe.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/daxokafisilejolewafunosu.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/14236024124.pdfIn PDF document text
    • https://harmony.im/userfiles/file/9288674604.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/zigawubobovenaduvafewuxon.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/taxexo.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/1132bfc7980486c65f1eb2b046e080b7/tiwonofevovexarerunanita.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56316293360.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/jujuzoxekaveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=superfighters+ultimate+unblockedPDF 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_off0000c1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C5 11476 bytes
SHA-256: 7e6dc5495e52fa7efbeede82e1fd30f9df61ebf157ede1e3fe0b735693b9fbea
font_01_sfnt_off0000dc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 16356 bytes
SHA-256: 1393b7a24fb6f6bd538f9d709b3bbb9c010d32bb53f8e947c9768d2b24696ed7