Malicious PDF — malware analysis report

Static analysis result for SHA-256 824a0611c00c82f6…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 04:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c0694e56d4efd0e753d592783f795c2 SHA-1: cfe1b73db3dc053433438e961d66ee5f689c9816 SHA-256: 824a0611c00c82f679c50843680420fcffcb1d0bceaaa8e4f2d9c4aeaedc2d10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious files. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/keruwizonob.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/bomunig.pdf
    • http://indexone.ru/upload/file/85740079231.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/4181733826.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe893f98d---pedulewej.pdf
    • http://pacemakerpressintl.com/uploads/assets/file/21926669933.pdf
    • http://rund-sro.cz/UserFiles/File/semesapofugobiwadubug.pdf
    • http://sipsak.nl/userfiles/file/88885717756.pdf
    • https://tedvandergulik.nl/userimages/file/32175583532.pdf
    • http://ig-einheitsloks.de/medien/file/jedoxugoda.pdf
    • https://tekstilkentrehber.com/upload/ckfinder/files/xotuxavapirixulodu.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/45628782381.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210922201538.pdf
    • http://phoiinnhiet.com/images/uploads/files/vapokuxudipiwuzifam.pdf
    • http://seoulgreeter.com/userData/board/file/nelixuf.pdf
    • http://ros-grad.ru/fck_editor_files/files/nefiko.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/def884bf31cfb3cd0ddf61d0a1cae6ad/92473013821.pdf
    • http://gift-founder.com/archive/upload/files/sefazelisuxawumo.pdf
    • http://form4concrete.ru/pics/cont/file/wizupetuvudum.pdf
    • http://gjbbang.com/userData/board/file/79763934698.pdf
    • http://giorgimpianti.com/userfiles/file/96034795002.pdf
    • https://thefencedocumentary.com/adminfiles/file/12191167596.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hopeless+land+hack+apk+download
    • 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_off0000b088.bin
eb734ce81886e889eec783e3b98bd04f2177fca491618e0220cb28912bc19ffc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB088 15676 bytes
font_01_sfnt_off0000d87c.bin
5166a1b4df88dd7aa068ee65c306203442c1848e7c75d23f316a286bfe21efc6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 10488 bytes
font_02_sfnt_off0000f046.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 16792 bytes

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