Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c94f36261a0f7d…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 10:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7f50c7914935fea38a9da5e1f8f4e46 SHA-1: 4335c9fcb5aa278d2b0a0a3af24f480216b6d486 SHA-256: f6c94f36261a0f7dadbb78e07e9baa80c3c71685c2dd6d06c08287b35496101f
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 storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment, designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/04a9a37eef49f811852e7aef7c061d36/81042183140.pdf In PDF document text
    • http://www.anjhimayath.com/upload/file/durazidamujupexu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d20e0447f9603f096f78174610401ae0/32909343552.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/70608805548.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3224021621d014585e82c204ba04e01e/mawanowisaluvupas.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/63916139988.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31e65413ee---wuvofaxaxa.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/29df495b61abd0830dfcdf7eb78fbbd6/barowepusipuv.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/b8gsjggpcbbmu764ms1s0olp1f/69288702577.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/puzan.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/gofipebakagoxowexubafesi.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/bipalugoxubivijegav.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/gufuta.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7586d45c---lubego.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/nebazopixifemaneruxozuwa.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/tasasusudobilolu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210714141001154.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/67900151485.pdfIn PDF document text
    • http://poorclarescork.ie/images/42599044479.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106222012.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35fb966a90---lilogoriwugebus.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe1a3ad8cc---sasupubepowamejis.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c89bc0793ad---renegekefor.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/0f0dpnj37213dqj189g10549d0/zunonig.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/jenegoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=estimation+and+costing+of+residential+building+xlsPDF 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_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 11144 bytes
SHA-256: 2efe52498fbb478cce445e586f0893bd727f25d7ff2182dd377017c008245bf6
font_02_sfnt_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 15296 bytes
SHA-256: 1be136d8396011e201855074ae846c7864d5eff295366a7d1c6f5fa0934da8eb