Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3284569dd52417…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 16:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca69b62bb22fa29e75c1eeb664ebe4ea SHA-1: d4f6936cd762909e778d1a81f2bbf65c25f56b5b SHA-256: ab3284569dd52417bc76ceb6b53c6de1ead0c098bfb2eb7b60317626c2b6ee74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=annabel+lee+poem+pdf PDF link annotation
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb58805fa---rifukum.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/9252353978.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/73882349924.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/77511980070.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/013f1b31f425161202478510caf2eab7/lumofumemelex.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/68261679194.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/27314910022.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/57758817366.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/19457340548.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/95927473565.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/48080034673.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909093453711298.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/99690977359.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/fanilul.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140f466c8b47---tizeduweb.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/galixufudosuk.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0b8d62f62ea2ee4c4f9ed409a956a2e3/25413117697.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/nutelo.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/51293157760.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/marafivikoniput.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef7a0c96f---11320217374.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/katasafug.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d33c0f244b---sovakatepopiz.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_off0000d913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 10320 bytes
SHA-256: b70262b2f108f6335fe7334495ef9d213233f7097076a111874b5475df75a8ae
font_02_sfnt_off0001082e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082E 18176 bytes
SHA-256: acfe3173c783931d0102aa196980264c457cb61cc5a82bbf05e2c1b7c47fb175

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