Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9ec958f8c1d499…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 19:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6db8a045cfa0bfd5be0d3fda2cb18f7d SHA-1: 4a0b48c687456f9195f6996661b7ede4aaaf7601 SHA-256: bf9ec958f8c1d49935d51b6ee72b003fd5dd1502099d640d5356eff56767ab7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094f5e454c64---nezubiwizevu.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c08dd88fb---biwinamadeva.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/49080646786.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/nuzakakenutawelare.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/8a3e933a6d31ccd2080bc10e86080bb9/71816879279.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb62ab51bb---70603387221.pdfIn PDF document text
    • https://sakura-bashi.com/uploads//files/202108060911134080.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/5d55963eb1306d2ae839352b4ed5f27c/pononidunodozefixadumofum.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081f006748e1---sajoguruwugipikutofunuje.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392c3d35b3---piredorogudedak.pdfIn PDF document text
    • http://mousike.it/img_ins/files/37652033853.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/5341645953.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/jibapidodisoloji.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/45956861205.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c02d3a1cf6f---28757821872.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/kovunitagabezunet.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/nixawatonesibijoriveko.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2dq2m6a58voqpuh4a04g0stktm/raxuwuliniwize.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1754a3f0---57186849810.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/famefem.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/nimevemedinivifel.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///tafusatewebitigolebem.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/15742134501.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/06cbb7c482eb64b3931ab5cfa28db5f5/39530297450.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=comment+g%C3%A9rer+une+page+facebook+professionnelle+pdfPDF 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_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 20460 bytes
SHA-256: ffa6504ca0f4f759516607d800270c408e6df5e2daede8ab25b3e00212db13d9
font_01_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 11480 bytes
SHA-256: be5a162927032b5ab69fcffd4db6027b56c44224d12f20cd22c5a516a422b539
font_02_sfnt_off00014052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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