Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c11a7b2cb2aeb9…

MALICIOUS

PDF

93.2 KB Created: 2021-06-26 10:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 32401c696311e2a9b105495db2ef4058 SHA-1: d9bbc8483d05976abd41dd08cc54e4f771aa15bc SHA-256: c8c11a7b2cb2aeb9ed7ec0bb4fd95e4e7d48f44d794774678a5dd29990c6a648
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to websites, many of which appear to be hosted on compromised WordPress installations. The presence of `utm_term` parameters in some URLs suggests an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://archism.ru/uplcv?utm_term=thick+face+black+heart+versi+indonesia+pdf PDF link annotation
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/142f768ac2c6441ea965d5eb5e1835bd/20778096353.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607876d2e4e94---15468212363.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867f9730f01---gunipira.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/j51ikmlgio5ikj0fshs5m2ko0u/67032650626.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca270d4b51---mezikujejom.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccbd77c6b4---kuxunejad.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51aa73468---kejalesujusulere.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/mozonoseki.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ed7dd30a53aee8e82ce1161270bf9880/komexamajal.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7fa5e8863---lepuraxu.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/778180ea8f2a9422efc61a258a37335a/16240673075.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2efb71bea9---pegagezegupomox.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/1b91c398eed33c0a759678c1acf81b85/dokidobidata.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/xirufikoremumi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073b6b550dcf---befedabiresu.pdfIn PDF document text
    • http://kaies.cn/upfiles/210530062007730531zxjgwg.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/96630425413.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce34a22230---20322257496.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf25a12c0---19117049052.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac66e2f6c2---56376325837.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/rubevexerijariwewivotu.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/fiwiwuxi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 10980 bytes
SHA-256: 2fda897d494a568c8b1b3ee3ef10ed34b8b302dcac9a3815c6bab83ec56a0b9b
font_01_sfnt_off00010be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_03_sfnt_off00013a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1B 17508 bytes
SHA-256: 69af717071377b6b1474d699cc0c4d67f6a8f5b69d7f5a7b54566ee8b3f2debc

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