Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b13e2ade73af04…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 03:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f05f0b40084fe869adb9b473a7fa08db SHA-1: 8f41af2a0387c2e3dd274329dd6ecd53ddb87569 SHA-256: c7b13e2ade73af0442048506d47d17f6cba5fb3ef48de20c5789b8432f54d20c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites that host further malicious PDF files, likely for phishing or malware distribution. The presence of numerous external URIs and compromised CMS upload links supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f6dcb6d1---razilew.pdf
    • http://tcihk.com/userfiles/susaravokaronovobojenabeb.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fu682qs7p5ulimae5kqntl9dm4/ruvizesoxogogisit.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7df914506b4d777ed40918eed171dc32/bomivawikorasebo.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/2kobe5g0usgn52382qqie4lcf3/45879292749.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f8250232b---40259168872.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/j85i7513un3kd1mauq4afj71aa/bujirub.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/b90be2a4b7803f732fc61f41b4f6fa5d/simevawusapepifodobapor.pdf
    • http://ajisushionline.com/uploads/files/furesukebemanajuvus.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd7bc11812---gizas.pdf
    • http://mynigaoe.com/upload/file/20210511124618.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6dc59bad5---41783760310.pdf
    • http://shelton1961.com/clients/35589/File/lixom.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6fbe89a9c686cfe902da47479125a495/tefuvometavawe.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160967b5394543---65399439757.pdf
    • http://abacusnancy.com/userfiles/file/71871636082.pdf
    • https://workinhotel.com/upload/fckfile/vijubawurexirame.pdf
    • https://e-fasteners.eu/media/file/niwojamurumojaremobiki.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8604ba9d6b---11051725944.pdf
    • https://o2opr.co/userfiles/files/47503928649.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tee30s3ohv2hmm79lfs6igccsn/75263945337.pdf
    • https://ludifrance.fr/userfiles/file/kikomorijipowowedokabifin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gate+xe+solved+question+papers
    • 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_off0000e631.bin
3abd940125e38401efa1f1081faaa25ded0518d257b768f7ac98405f1f20e35e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 17236 bytes
font_01_sfnt_off000112fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 16792 bytes
font_02_sfnt_off00012b15.bin
c2bec0c819c5cb15109d6e7292ed125186763a4b78195f1385ac8735d1a90f98
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B15 10840 bytes