Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd87fa1c509a2dc…

MALICIOUS

PDF

73.1 KB Created: 2021-08-28 08:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0b079cc7818c6da520f9ce59e43e741d SHA-1: 97d114ba4f3b4b0e17a4a70c7be9f1ebd52f7f44 SHA-256: 7fd87fa1c509a2dc1dc8d86723ec712e46e0024367c1f29ea4da84f7c38337c1
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751e6d4c6da---fuvuxexofasesukeras.pdf In PDF document text
    • http://emusicmarket.com/upfile/board/files/modewosazipenadenuwig.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c26846909d3---wamuve.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/68787154645.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd7d3473a---menazibamotaxug.pdfIn PDF document text
    • http://gysanya.com/upload/file/210730022322622481wou56zhgl55o.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca57756b3e---59673716027.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/mojimikobom.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///97371816177.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/fitapazavaregebufovekeror.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b0bd93b7bd030d00b98d935f4a25a37d/zokufimadafuzafu.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/39446225778.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bc594a460---84246228954.pdfIn PDF document text
    • http://belv.ru/userfiles/file/lovekesujagu.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/fesefapetubuzoxo.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/91383866354.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/zodifuk.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/fuwewosezexogiro.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/o96lb19rl83na37u9jjkjbl903/1541019298.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/97633568485.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/80774379919.pdfIn PDF document text
    • http://schubert-hh.de/image/file/nobalosidewofog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=this+hurts+me+more+than+it+hurts+youPDF 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_off0000bc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 16396 bytes
SHA-256: 7ca1692cac167d0bb0c245518ae77ca544c49dbd6d3ee51dc26414075e67331f
font_02_sfnt_off0000fe83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE83 10504 bytes
SHA-256: b8bcbc3167071f9828729bd2c32179bd06c6bf6ce42ef18a6b71861aa34f04f3