Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81a112bcde3986f…

MALICIOUS

PDF

89.5 KB Created: 2021-06-26 07:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce2c506776020fb2b4a71b6947bc3301 SHA-1: 255cc358dc0674a2c796e12b94699416ec49ed7b SHA-256: d81a112bcde3986f603bc826e3aa787b618c5514bee19515264e20838b5c826a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa658a421---35957492880.pdf
    • http://kameleonhastanc.hu/files/file/61488522963.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ed4c62102c0030c5194436b139ee9571/59642994014.pdf
    • http://altinay-law.com/images/file/zakegewomipozinadelewewop.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/533733473b165995b92929a49b43fa13/39003225916.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb57b16b57---xavatepogupuxasazabij.pdf
    • http://playeasypiano.com/resources/fck_images/11127759198.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4cb3332bfa0dbc4c985d203a47a30e48/86946823006.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rfdcqejhtgpro8tj1jfm3jkl90/purajemekevulugerutenekos.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f54f1c05---1518072400.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d516730bf1b---dalodakuvuroderererunet.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/19b51b7ef1e8d964110c98ed81e3e18e/32933960490.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/2c2b900c64ad10dc37ee9a2647b6c6ac/menari.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/958bb88265bfe8547685922b192fb68b/13524554526.pdf
    • https://charterboatdeliverance.com/uploads/files/26163569226.pdf
    • https://eobliecky.sk/userfiles/file/30403833891.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2943881eca---40969979843.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2e8a8d1c5---jigijosetewuvofotunujugaz.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ca178f3c6---27322240158.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e9ad203b---62534266490.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/noxub.pdf
    • https://motelandratecuci.ro/userfiles/file/66675524030.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bce1584f4ed---57293843930.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=in+a+blackout
    • 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_off0000fd8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8A 16792 bytes
font_01_sfnt_off000115a1.bin
4cc4cd980b43a836304b3b27a088337f73def56c650f32db81e12054a64335d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x115A1 10016 bytes
font_02_sfnt_off00012c00.bin
096f648d88217d2c52e66100515ee98b2ddd16aa94c2e9d1a27fd83c9908c0e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C00 17080 bytes