Malicious PDF — malware analysis report

Static analysis result for SHA-256 1456710bb79e6aba…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 14:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3435a329fbd272f5641216d66360702f SHA-1: df343ba909356fd9653df83d8b5559cd49b913b6 SHA-256: 1456710bb79e6aba45b800fdf8d0c1a6f170b20dc5d26ade15f667a391c305d7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it is a link farm hosted on compromised CMS uploads and disposable hosting, likely designed to lure users to download further content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document's purpose is to instruct the user to open a password-protected archive, a common tactic to bypass gateway security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/losopivonibaforen.pdf
    • http://ylplj.com/ckfinder/userfiles/files/6022861212.pdf
    • http://architettodrabeni.it/userfiles/files/84482937817.pdf
    • https://tese.in/ckfinder/userfiles/files/fefaxumivekapodi.pdf
    • http://alexdisinfestazioni.com/userfiles/files/72637166712.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f098c1078f---gobosalabenako.pdf
    • http://watdoenwevandaag.nl/upload/61697014433.pdf
    • http://trongtinpc.com/luutru/files/zejixifav.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/56495995833.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4e772935---38599123592.pdf
    • http://adria-ex.com/images/blog/file/mewufumusemupebegaxonu.pdf
    • http://105chers.netsociality.com/upload/files/42715648584.pdf
    • http://www.ondebiz.com/userfiles/file/45589935526.pdf
    • https://termokingbt.com/ckfinder/userfiles/files/retotanagomuxuvolazuriri.pdf
    • http://escritacontabilidade.net/fotos/news/file/47436425233.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161409075b84ac---puvabisuxiwagan.pdf
    • http://dar-tom.pl/userfiles/file/71654249084.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a3d7a875---vumewisigosikiv.pdf
    • http://pololanna.com/user_img/files/13147555659.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/29003014618.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/sqffpo2mk2mdl69ohmivi8tgr0/5252235212.pdf
    • http://www.fashiongale.ro/userfiles/files/fitawibexizuve.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c45f92fedd---julozutomemomogotiv.pdf
    • https://akanaymatbaa.com/calisma2/files/uploads/30126566760.pdf
    • https://cplastik.eu/data/cms/file/vewozunoxeviponojewika.pdf
    • http://blackhorsesc.pl/userfiles/file/61378241987.pdf
    • https://nirkongrp.com/ckfinder/userfiles/files/goxeji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=impossibile+aprire+file+pdf+su+android
    • 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_off0000d6df.bin
a0e31e9d9243bfd49bf1ec363bed092f1072da079e68d6a193def611ec598375
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DF 17088 bytes
font_01_sfnt_off00010338.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 16792 bytes
font_02_sfnt_off00011b4f.bin
b369d58973f2941f1413d22df2e7d2013b63298f5d113c3ac85a33ab1a4ed55b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 10752 bytes