Malicious PDF — malware analysis report

Static analysis result for SHA-256 69996e07eb5167b6…

MALICIOUS

PDF

98.2 KB Created: 2021-06-24 15:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 54d952f289503660c868d6b688a5dfeb SHA-1: 9635939229c846040657313e9f398f86355d53d0 SHA-256: 69996e07eb5167b640ac2369415b5f9a03dcfcf5c4821602040cb7cf09077685
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/6949096bbed9cd6e27e44a416d595735/pibado.pdf In PDF document text
    • https://bleikss.com/userfiles/file/sokibo.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/q65asvkhib6hsfnfdbhcgkcci0/runekalasuratufilosok.pdfIn PDF document text
    • http://unsersohn.ch/images/file/nevewonabufuwawul.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/53390919010.pdfIn PDF document text
    • https://landi-bg.com/images/file/zumaluzaguxexis.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/galejafexigu.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1297ec18f0379ba9f544fbd5c6a44445/joxifixolazewituxipodagu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5f6d3b4e159096ec1ee0c0890fcf9db8/73653706383.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/bciffd24a9jfkh5os4l7ampbh6/pobasesujujug.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/zosigekuwuwobaxuxen.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/genavufe.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09c10a946---27848033922.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e7beb7c48---sipolenojexaliwelufe.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/812ec061d647a7dc18bb91f1e475ca99/80535106658.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48873265083.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/fanukeliv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=clash+of+clans+town+hall+10+basePDF 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://scripts.sil.org/OFLIn 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_off00012c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C18 5204 bytes
SHA-256: d17995730a3dbef1f9317d7692c23425a8555ed896ca41d08fb2c97cce995981
font_01_sfnt_off00013de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE1 12052 bytes
SHA-256: ad3821d9c17fce7170c9c26d3ccba64e06a41d508efa199c6acde44bbda42b30
font_02_sfnt_off0001663f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1663F 16212 bytes
SHA-256: ec642c0c8cb4f3b35d1f73599536827236816adbcc6de52dc79cf03831f5195b