Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef2b5117c880d58…

MALICIOUS

PDF

87.0 KB Created: 2021-08-26 13:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c6e64ff0bfbce2696aee202202e2de3e SHA-1: a414f9178a8b9a384d1b8781eea9317abc09d142 SHA-256: aef2b5117c880d5867af9a9f844766f095a1259584fad66911b8ea26f6feb810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9957

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 http://omegapizza.net/uploads/files/gipakugifewesi.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/01ddfc8f942cf1e0fe1dc7ecf259ba5b/fetotetoteni.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/makefuwefowokiki.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/20598029149.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/kufuse.pdfIn PDF document text
    • https://hutechsolar.com/upload/user_upload/files/fenurulizedo.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/32619239987.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d95400b152c---81725896375.pdfIn PDF document text
    • http://fittbikese.hu/files/file/81783513464.pdfIn PDF document text
    • http://namngonviet.com/user-/files/wuxoferaturoru.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41ff2a818---gatitelefew.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/dirulatopebukitikatoj.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/junutipijimuxuzeb.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/4d21cb2fce3226bf3722a5173bda4753/duwufesajuz.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/19f4612e083767761bfa867ba6ee1155/77866204246.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/19771493421.pdfIn PDF document text
    • http://fivesteps.pl/userfiles/file/72340979195.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/46277616682.pdfIn PDF document text
    • http://asvpp.fr/pdf/nomufozisi.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/11475052487.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/lelugofixerugevebufar.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a9764c68ce045d1e49028b8a067603f4/87971534375.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8d20a41d0---defizul.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/85922691286.pdfIn PDF document text
    • http://trivio.it/userfiles/files/kuvoxubosili.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/65029066789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=signal+%26+system+notesPDF 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_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 9732 bytes
SHA-256: dd7bf3131684c638083584c8f58b3645d88fd854d8290a5405c847c6bddba5cf
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 18124 bytes
SHA-256: 8593e1b1e38a499e94ec2c437465b8293a24ca86d07fb6f7a2bd84898e93317f