Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cbfb900b4e4a3e…

MALICIOUS

PDF

89.7 KB Created: 2021-06-29 20:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21fd9397e6ae2c259fcf44c1475f8273 SHA-1: 5005b1056019f1eb2a4f6362c0190045fb4b793b SHA-256: 41cbfb900b4e4a3e99c8ccd3e20058187ed014477b1402f7f0390b10a72a649e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://drafthe.ru/uplcv?utm_term=the+story+of+jacob+rachel+and+leah
    • http://magnachip.cn/userfiles/file/20210518164440.pdf
    • https://acryl-bg.com/userfiles/file/37969312365.pdf
    • http://tryinvest.eu/userfiles/files/8327866017.pdf
    • http://gamjagolla.com/uploads/files/44265294506.pdf
    • http://akcjonariusz.com/UserFiles/file/lijiwiliwidijujizup.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/48fe28055fb9b0cb5d0cb0fa8ea9e97b/23314747625.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f6ee2b0de266ac78bb8e26d5fbbfc784/pixaz.pdf
    • http://aj-logistics.com/stock/userfiles/file/35827311704.pdf
    • http://berbun.com/user_img/file/bekasesuzikivudewukeviluw.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/21389a61f2b14a4159081fb225e20f19/74118881262.pdf
    • https://ajitcoatings.com/uploads/18402287821.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/a145b6d675bfc039c0e148456c3f5d9e/panosowur.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160757e29cac13---fewipigobazo.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160760d91f251d---68462684119.pdf
    • http://daiichihr.com/uploads/news_file/96591010768.pdf
    • http://medica-eg.com/userfiles/file/fusiranirezolosasanadis.pdf
    • http://ingenermarket.ru/userfiles/65390729131.pdf
    • https://holocaustresearch.pl/nowy/photo/file/92041796753.pdf
    • https://chp-travel.ir/data/file/72305343692.pdf
    • https://epiphanych.com/images/file/voter.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b1ede7a00---lonam.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b10d884c7f3---nawebojekabosonubofusol.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/g5sbgt0540j9qtp06bbu4m3gjj/95087831743.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/werajewojaxipuw.pdf
    • http://acecaalcoy.com/userfiles/file/kenip.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_off0000fc1c.bin
1a90c6a8ca9341f49fe92f8fc032a87c09e5b7439228d7bea74f67b7abb022b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1C 16988 bytes
font_01_sfnt_off0001281d.bin
db9773207c676a8872a8c7ed2fa85b049e2378321046c2671f70affc5180c2fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1281D 10828 bytes
font_02_sfnt_off00014123.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14123 16792 bytes