Malicious PDF — malware analysis report

Static analysis result for SHA-256 0732bb1af574c209…

MALICIOUS

PDF

76.3 KB Created: 2021-09-07 01:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 30d1e1aadfa1f59ac8d270dd3f9698dc SHA-1: 7d2e099ee0292590428b84b798dbf8a09c2359a0 SHA-256: 0732bb1af574c2093f4d0380ab2a60d26e56b0b68eedcc8fe3f2785f278a4114
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via these links. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pixomot.ru/uplcv?utm_term=2019+forester+touring+manual PDF link annotation
    • http://charivne.info/images/file/99574119608.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608266ee0a043---8270835577.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/21258082650.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/rijolofetuta.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/disolefuwumutib.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/66634792085.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbb59bda53---rivodikixunew.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/82391024848.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/3d2lgm0mvdgeoaeo0eb5tkmhun/23684150297.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/45773903704.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/e891244455072d971cfa12666eed844e/talomadibalefinedi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wudur.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/508eb45c796afa739ca9f8d81e8d2d67/kunozugupuvuz.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/96482222274.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/25058264545.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a447049a1d72a4a1f627254778076975/63333439732.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/70669891012.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/tokafuwesemutawojaxupub.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/td8tfhfvtfdk813ohu0r7to91u/sidufok.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/92934644325.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612a0ce26cf47---1642934561.pdfIn PDF document text
    • https://securitydm.com/slicice/file/kamaluxelado.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/86800466352.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_off0000c3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C8 17936 bytes
SHA-256: 6200805d303a8d67a078e67760456fe06bfe651fe614b353aeefdfb8e2f362f7
font_01_sfnt_off0000f233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4A 11020 bytes
SHA-256: a456a7fe1531154981127b2384fac47a08b3c9f456eaaf7f82766b91c8f43330

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