Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b93d6dbd9ac741d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-19 06:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8779a184abe81c3b2e6f6ecef41bb85c SHA-1: b5118c24f24ac88c477c2b2af0870561f7de18b8 SHA-256: 8b93d6dbd9ac741dd601341b4aa36c9a2a9028456c28dde632f1cef0a3e00c8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are associated with link farms and potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://medvor.ru/uplcv?utm_term=bad+moms+1+streaming PDF link annotation
    • http://kalikraft.com/images/file/48138707859.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/89456726302.pdfIn PDF document text
    • http://exim5.hu/_user/file/texekagit.pdfIn PDF document text
    • http://stylekd.ru/files/mabojekiveli.pdfIn PDF document text
    • https://betsin.org/userfiles/files/kemedifuwojejobanev.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/17466024108.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/60716921559.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/63711700525.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b75bb2e8c---5526963933.pdfIn PDF document text
    • http://abwrva.com/uploads/files/87496413518.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/fukunuzifugepugemof.pdfIn PDF document text
    • http://dd-eng.com/files/files/vagupekewuguroji.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/josuwiwesogimuxugomi.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/gogelabawenonoropidawo.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tarodixeki.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a86fe2ebf9---20931179844.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c78b2197---77683641187.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/3576471286130f5bb42f13.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/85998370235.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161300b2760881---patijijojufe.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/62975300268.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kizanaxebazapanepaloj.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/wapades.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_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 18012 bytes
SHA-256: 9d858923409510bda1d1809ef49e11afdef7eb66dbb88b378a8d3b8309193cd2
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 10648 bytes
SHA-256: 21d10dd739feb4f67ecc232eaffa14d84b2d6cd1efe792e9f8c3b60317f0d73c
font_02_sfnt_off00010fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1