Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ea26c4fe67b298…

MALICIOUS

PDF

89.6 KB Created: 2021-09-04 23:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 855d72651485ee927496e7d1373ca687 SHA-1: 993c3da880f3bb2ddd6514bc0d574ec3c935eae2 SHA-256: 11ea26c4fe67b298080151641ef27e8079882dc40605cb8d81285249b87f462c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics also indicate that the document contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host or distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.julietlandau.com/fckeditor/userfiles/file/zepiwomezudap.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/ba7d6afb0078674ffce50aab9a2bcb74/74052493336.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/04279f0fe609c49c19bf820bdb97fdbe/56311004427.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/35f99a2ac23c83feba8914877fe0d846/30022202041.pdf
    • http://zjlytl.com/images/upload/File/34545751934.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/49toia6a2ed8bebe9o3eosubt5/basutudedurisetibi.pdf
    • http://bettynblue.com/upload/fck_img/20210522/file/27262459779.pdf
    • http://sujitonweb.com/userfiles/files/wijiferulipoxog.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bebc7f36b7---62207478162.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/97160380618.pdf
    • http://mgocsm.in/userfiles/file/vugupoda.pdf
    • https://anakaygame.com/calisma2/files/uploads/81477864925.pdf
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/82415971892.pdf
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/c2d7749b376007228bf9d3f77cd58112/4418514769.pdf
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/35171042828.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/cbbf332829ced7a2d24b519ea0a18058/2049727700.pdf
    • https://salvatoredivilio.it/userfiles/file/xidov.pdf
    • https://sbsoftware.ro/admin/userfiles/file/37039938410.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160856be7904f8---73479238980.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/e27847a35d0798688dc8f9fa005d6d59/87829063504.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/88280586c8b97b1c33a31545b9c2e57f/45844995462.pdf
    • http://lateonsettay-sachs.org/userfiles/file/joxivaz.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160833b92c5f60---xuzaxodinorada.pdf
    • http://monkey-do.net/userfiles/file/1991287290.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f55b905ae2---43111857716.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=serenity+capsules+pdf
    • 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_off0000f71d.bin
b28aab3c60fda6e83220c664e8255f25c1115c5a192fd1ed3755c7f5f61c8986
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71D 10780 bytes
font_01_sfnt_off0001100c.bin
fee4b13b5531d622bbf4f58f1387367ad299c896dc11b656831a515fc670129d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 18784 bytes
font_02_sfnt_off000140d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D7 16792 bytes