Malicious PDF — malware analysis report

Static analysis result for SHA-256 9464c594976703f6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 07:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1a353bb7c19ca360f126c880b223b6e SHA-1: e349192b9ca33f70c9adef7facc48583c825ca15 SHA-256: 9464c594976703f61f9852879c84c86eafd6e42230e1a7d8dc845f65e9375485
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=watch+just+one+of+the+guys+online+free PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613eecd6e7c47---bepinelewevewivowob.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/safamoj.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/98072936848.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/53877932804.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/19941433949.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/gukujavemabipazu.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/gijebanolole.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/10757164780.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/60644035894.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/89199729202.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/79238646574.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/jejusajojiko.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/44607563307.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/texaxokegiza.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fefupabiluzugajudaf.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/92012903357.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/26127882666.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9ee37d47---61038791060.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/8223112725.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/zifiposutipojodafisut.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/13612463108.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/57320582649.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/s6d20lo4pa7596l3cnrt65tu30/40228464155.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/norilamezedexupanatu.pdfIn PDF document text
    • 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_off0000db52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB52 18200 bytes
SHA-256: dae49812da226e49c76fe1ce478f87229128cd4a1ddb51a917339ed7a16f7886
font_01_sfnt_off000109ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E5 10952 bytes
SHA-256: 255aacd22cb332e6722299c4741f54e3ded67528d926863d91b145993c521891