Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c47d4357b8b175…

MALICIOUS

PDF

68.4 KB Created: 2021-09-22 19:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a82917a2ba33f1b5324afca06892c49 SHA-1: f954f893075adb109285e95e0f02c7f9618254bc SHA-256: b3c47d4357b8b17522c70bf6c98940f1b068673bc3f52069c113191306cb9375
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=mod+apk+gunship+strike
    • http://studiodispirito.it/userfiles/file/31554754293.pdf
    • http://alnadaoil.com/userfiles/file/26191693690.pdf
    • https://mimpishio2bet.net/contents/files/wuxafudefodozafekofejezog.pdf
    • https://5974293.pasarantogel.com/contents/files/50120847933.pdf
    • http://bona-agra.pl/Upload/file/14298777774.pdf
    • https://mmszke.hu/files/file/dagupigarivabepan.pdf
    • http://special-pharma.com/upload/files/55404313061.pdf
    • http://wingmanresearch.com/userfiles/files/jixixujowop.pdf
    • https://deltarealestate-eg.com/userfiles/file/bepumupipofupe.pdf
    • https://campermagazine.tv/public/file/98128532100.pdf
    • https://doluhosting.com/calisma2/files/uploads/najawexaluve.pdf
    • http://architettodrabeni.it/userfiles/files/56291156523.pdf
    • http://obedovice.cz/userfiles/file/12583726098.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/17448047980.pdf
    • http://ehomeforeclosure.org/images/file/43966364637.pdf
    • http://inter-travel.hu/_user/file/jixominagotaf.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/27851806975.pdf
    • http://konemara.hu/userfiles/file/nekawakesajeminagilotalob.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613237dae0f22---ponofowuwaxobumo.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49f45c62d---dekefogekazafaga.pdf
    • http://khocabien.com/uploads/files/74358541218.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161400ca558b3c---96538481966.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aea9.bin
d70c973f2510efc0309bf803e16879dc87f88368c4af63b5a2235b3c2ee7d533		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 14728 bytes
font_01_sfnt_off0000d3b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B6 16792 bytes
font_02_sfnt_off0000ebcd.bin
033d8dee39288d849d8aaa401a0cf1347a40ac0c54c76a2c3dda5fd263c13642		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 10808 bytes

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