Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fc4ff599583a6b5…

MALICIOUS

PDF

86.2 KB Created: 2021-09-01 20:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28447800dec7cc7bf87ea1dfedcc3ee5 SHA-1: 7c4fe737d05c2cc3a9fc1da7d65c4231579cfe3b SHA-256: 6fc4ff599583a6b5753674f95c0abe994817779eb7cae970d3f8e2f985ddcaaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://themis-lex.com/userfiles/files/57688005792.pdf In PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lulovizoduguge.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/20487128258.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609161dd8b709---dubinavu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/87733637856.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5qg55a6vg2vmjaqla4v0gcvpt0/wotogixakejilajesowaduroz.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/39655568134.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/54400730861.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/58104322421.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/livalopidetomobazonuper.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/sazafekudu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d77574880d7430a6d4cbe5acf865650e/polofefole.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mubuzuluwezeporuxusijipa.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/kefiwabujux.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/13529627346.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/43438822781.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9bdddee4a4412546e6aedaddc6ae22ff/5750380976.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/buzewuzamikedadovoxewu.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/16068379863.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/743f4de14302f90ab8929c2b4e1edaff/pulatonatuwiluxov.pdfIn PDF document text
    • http://aurora-c.jp/files/files/nekibuk.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b2a5d209---618122177.pdfIn PDF document text
    • http://bakoca.hu/files/file/62757479007.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/025r6efq3ivrak42o02ikfnoe4/85778436009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wral+lottery+daytimePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 10244 bytes
SHA-256: 5f7b22bc524216b967c2c864bbb89ca259e93441bf3e83498ee15bac5981d7a3
font_02_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 18632 bytes
SHA-256: 3e36f806b7c8d3fbb6235cfbba4a0ee081df9ccda0210302d1e8e59c960fc87a

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