Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f362abd6d62b05…

MALICIOUS

PDF

84.4 KB Created: 2021-06-25 17:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 067915ff785eeedeff8ed7c0f259edf8 SHA-1: 7248a2f9c59df2e4093486522edaefe4e135d3ce SHA-256: 23f362abd6d62b05b63c2ca1a91ff0475fd3a83b2cb04b74cfc3f7aa5cd3670a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress upload directories and disposable hosting. The primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the presence of numerous external links suggests an attempt to lure users away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=linux+pdf+to+ps PDF link annotation
    • https://locoffice.ru/userfiles/file/25870932960.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4d379b9ef---57503144934.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/95500dc1a74787a6867c1f3014c5b485/58055405571.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/pesezone.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/9527b24d6db3f39bc628c29532651cb5/karolumupuwusozoxodu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dccb87daf9---jagox.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/98864922036.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/kovasasodemeroxin.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/pabamukujig.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16072e92f483fc---jivozajuzibotapodenafofi.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/nampbus6sb3ulhlt7312fatjpb/94271921199.pdfIn PDF document text
    • https://fultoys.com/userfiles/52514907040.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/040695bf515b49a9816809d42aede7a8/20500473798.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c77f81577d3---pesevazo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb67da32505---11559721181.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbf25c689---73544213884.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/64053167801.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/mosola.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/61728480781.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d6699a0e9---59895532015.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbc65fabd---45983995166.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/morat.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dbe1b2235---vukowiwexefodoladusuzako.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/db74e18667c4dc2ab868d95d54f49301/bijusasado.pdfIn PDF document text
    • 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_off0000e87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87A 17256 bytes
SHA-256: a75d3cf0c937e4bcc0a8849072b8334f7b2d22a95fc263a766569ba2fb2fe025
font_01_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 10208 bytes
SHA-256: 7f5196b617b6e0f9ae399b726874ba431165aebbfc0a5ecb849d090eac889e26

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