Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f45ae38d27bc8e5…

MALICIOUS

PDF

95.9 KB Created: 2021-07-02 06:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2192207c6064db667fb4c4383b534ec9 SHA-1: 91657b8ebc6c4087b6da464bcf2c1ab8a699329e SHA-256: 3f45ae38d27bc8e54c40a4cb7b7e7a0874b0bcee163ad12494128710e346a190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d8d4acea054badf994f269a459265a50/ruvof.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/94214b6eec40ae6a8fd5fd5e11b57d7b/ripaliw.pdf
    • https://chinese-wall.tw/upload/files/tuzoruw.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f9d741987---nirugaguvolidizudikux.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7fae9a70---logano.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/disosoduwalegivupitiw.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mjkmm1mbjkilmfo2c44hollunh/senizafajologufe.pdf
    • http://wittlich-luexem.de/userfiles/file/79629823819.pdf
    • https://tolgyesvolgy.hu/userfiles/file/xorivagafowokuk.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b587d2dfdd3---33457401764.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5267cd44---27004800157.pdf
    • http://animalscipublisher.com/files/upfiles/file/kenurugusoba.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fefigabonelubalubakovikot.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608301aa523f2---puxifokafinurotovabebe.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/dovavubewupa.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecd7ee62c---12760023814.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/sbj5q17d2ehg3hkfnl9e6qi9l2/dakebi.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a01877c225e---luwekegu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1db890de---natajorurazoxi.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1e71e1a3---89223444465.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871fda1a097---bipenumibaziloretave.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/7f7a1ba6919d4c7b765d3924906562a7/23357438529.pdf
    • http://cephedanismani.com/images/pages/file/32702370208.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/rf8433nu8gbbi0trpb2lni85q1/62231433638.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a406bbd754---zewogowubavojesum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=uci+bio+course+offerings
    • 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_off0001116c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 16792 bytes
font_01_sfnt_off00012983.bin
1c0d79ca13bf4065ea1accab4675b730065aa19487581f51e1ac214e9c49670a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 10452 bytes
font_02_sfnt_off00014159.bin
34ddcc0c70908c96defc78acd785393583ed9c39a3e1c310994f8e0ae2a57e22
pdf-font-stream PDF embedded font (sfnt) at offset 0x14159 18652 bytes