Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d9d38fa557e247…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 18:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c9120bb5110ba46d81510b010cffe350 SHA-1: d79a4050eef57cf10463558e41f564009591df4f SHA-256: a3d9d38fa557e2473c48f29378687dc3a722da1aa3ef7204b0840b651d7f6090
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://firmykominkowe.pl/Obrazki/edytor/file/47876684695.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078e01e7cfd2---refube.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/19ba1ab03f6c1a2c6832330d69e591ad/dixuzivuxavepiperive.pdf
    • http://mldinsaat.com/image/files/76513037469.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/56a625a3531bb5228a7662a619e986ae/20409191993.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/7c692cf7e53ed278a9fe941acb57d395/paxoripifede.pdf
    • https://floridainvestment.cz/files/file/25631202484.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3c9687d14---53091753792.pdf
    • http://bassbasement.org/userfiles/file/37347725261.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c107429e745---51721640845.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mcl4p3jfple8ggtnsm3s5vq1c5/vubaj.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210503043615475961tomv8r.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/54cfab0abe763f746b56e797857c63c9/23014672214.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df9fb4346576094695e3ec2416e14a79/sagugofol.pdf
    • http://skolicka.eu/foto/images/file/73134001124.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608744b58896d---vulukoja.pdf
    • http://usmleworkout.com/files/file/wimuxebobopiranum.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/8bjb4ai40nqvm1qsu3mvk35b0q/komobapoduji.pdf
    • http://sosnovgeo.ru/userfiles/file/baberogafegatikowaxepuri.pdf
    • http://vistobrasil.net/uploads/file/93018959408.pdf
    • http://shreyaghoshal.com/konadnew/userfiles/file/73618940829.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d202d4114---61971211075.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/575009e889ee9412fb5f6a2281ee27ff/92133505285.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/2e9d38561e2a9b8e8693d901e2209e38/zitidoxarat.pdf
    • https://samsunyapi.com/userfiles/files/75859169521.pdf
    • http://budaikepkeret.hu/uploads/file/guxifetami.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=assistant+property+manager+resume+objective
    • 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_off0000ed67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 16792 bytes
font_01_sfnt_off0001057e.bin
ed59a4f117d2c3157b823a41498c146b5a33986c266d5df0181d543d09dced34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 11204 bytes
font_02_sfnt_off00011f93.bin
fcedcc58e1506f7e42ac0ffb334aff4f3db1f17513d74919b1947243ee6ba85f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 16956 bytes