Malicious PDF — malware analysis report

Static analysis result for SHA-256 e020c6a3ed399156…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 16:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9b5477da9d1e30d312ef832420a52223 SHA-1: 46a07ac61b1ed01e44383075292cb7bc96d1144f SHA-256: e020c6a3ed399156be2e1fd27ac07939bdebf5f4eb7edd0776ca0e28906036cc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=age+as+an+independent+variable PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9a25344c2---91573486759.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54ccaa5345---suvoramoxora.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/11327652456.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8a0b80c6f079758d9a449fbc2752f573/xasujapigodelimep.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/nilirixisenedi.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb9acd3caa---70744769441.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/88117727100.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7511a21f3a5f4c20a71fabea7a45d27e/geranivuwizukifirulelete.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/likomomukugawunifutoz.pdfIn PDF document text
    • http://suankaew.net/upload/userfile/files/77135314961.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7a5c4b7696---kosorajarebopijudanibiza.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/danifalusabu.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/tilakejilobixabep.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/86894920327.pdfIn PDF document text
    • http://benrassam.com/uploads/files/zujisubabowilawotexigakix.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83adf1283---tunimufipuk.pdfIn PDF document text
    • http://keiganproductions.com/clients/863431/File/33961671278.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/zaduveza.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/65762564859.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/61933258694.pdfIn PDF document text
    • http://ausafe.net/images/art/files/716174919.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/qrtc6eq90gc813bjoceqmrk0o2/losomumuvubowuwuguvarok.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/tibeberijixek.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_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 16820 bytes
SHA-256: 0fac0e4dcdb09446a6b5b8ade31517c53b3f307c988d847402d2e37992b344fc
font_01_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 10636 bytes
SHA-256: 45ea8e45c17943f2b17d91aba44424f1505956eb23608236c65509bad80ee7a1
font_02_sfnt_off00011c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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