Malicious PDF — malware analysis report

Static analysis result for SHA-256 1816b89f2be5982c…

MALICIOUS

PDF

81.7 KB Created: 2021-08-26 15:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4418e753f2f64b8aefe124003532e4ef SHA-1: b17efe5016c999b1dddecc1ffbca72ef66dde551 SHA-256: 1816b89f2be5982cd8f651f5b2830ffb36e2aed0bcbf962be14ea2c15fb875d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution campaign. The document's structure and embedded links align with common tactics for luring users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://archism.ru/uplcv?utm_term=ai+proctoring+meaning PDF link annotation
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8039f107ab---tekuninu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/f2gev6d7p5ifd9tfqkrh00ao22/19862241981.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c97049cc6cb---95044979715.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/kuxefuza.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/1896942968.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/zazoxake.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee881ac4c2c---45261490538.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/18153457837.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210529202248.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a3dd01dfd---94616248525.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/68fcc8f13f48266a385e51f06e9ec185/63726203337.pdfIn PDF document text
    • https://rinducm1.com/contents//files/44332034074.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608f489059210---52586559990.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce476c754---kefoxe.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/jibag.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/59238919382.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/vatoretujebagemibetu.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e89b3c5cd---19808166597.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/92nqpa7h4og8vlsct9map5roq0/mikajizixoxuwugob.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06cc389bd---meragun.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/45251989806.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/nosiwegetazalasevin.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/2723ad22e4e97dbd5eedc5f320711307/mexagav.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1bf80ba37d7a937fa2341017f5c7ae10/733768387.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/gutasawanemo.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_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 16268 bytes
SHA-256: 0ded669788dd6c3b8bc1e4379c358bd75a2e147af927261d04d6a797609e236b
font_01_sfnt_off00010861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 10484 bytes
SHA-256: 4579489c0d5e9926a8c6d9655f9114e959e73a37b719bf00d16d763ad4e79460

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