Malicious PDF — malware analysis report

Static analysis result for SHA-256 a448f7345ea0023d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-25 04:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9db5515938927f3470b52e27028e6071 SHA-1: 5c7e81c4becb5bbec95af6ed6dee80775a14ca48 SHA-256: a448f7345ea0023d55674b0dffbfbe33b212d778787c2498b112b277020a127f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host malicious files or redirect users to phishing sites. The presence of numerous unknown URLs further supports this, as they likely lead to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160758c2088b06---57906826559.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081467906cdb---70025461113.pdf
    • http://espicycooking.com/files/file///94918997074.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607d82d18eb1b---jisofagugezovezofej.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/03feb10fbb7423c471b3e70e9a613441/43891202005.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/vm4uqdnt90opur8urlpbkla8qi/pufetegomekebezajudix.pdf
    • http://thangmayedex.com/webroot/img/files/wanotuduzejurobin.pdf
    • http://doanekeyes.com/userfiles/docs/68322777609.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3utm61cf1721c99cu2tfi93okl/pesemabibowemetar.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738cf43e28b---59661750494.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf79a67add---10266194243.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b3ed4c8c1a0384cac3d13a9523ef2dee/98938341790.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b726b28e8---61802894012.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/paluzazebadedalisujizaja.pdf
    • https://toskov-yordanov.com/userfiles/file/50212140337.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0da3ece6fe---64539538210.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021791758552502.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eb007b210---83632486221.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/70f12c807bb2fd6acef25bcddfdf8c21/wavadoxagimukub.pdf
    • http://chickenwild.com/upload/contents/images/images/sulavepe.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/qvu91vp7bq2dohmb5am0lmlqgt/sakamarowokuzar.pdf
    • http://prmakeup.com/Image/files/39296842594.pdf
    • http://sun-eko.eu/files/file/nopupagajemofotobologozub.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/lagodolelawemanimomiwu.pdf
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80928957010.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+create+your+own+personal+stickers+on+whatsapp
    • 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_off0000f0d5.bin
31c54761697e6e408179d0181f63147e8b1d79c579d37c9889b163304ddab3df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D5 16984 bytes
font_01_sfnt_off00011d0e.bin
4ed158f5c36b34333950fb2878632aa109b3c18bb8671853ec35d3c258b9eb19
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0E 10852 bytes
font_02_sfnt_off0001361a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 16792 bytes