Malicious PDF — malware analysis report

Static analysis result for SHA-256 5132d9679c55a030…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 03:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 369b9c4da78ce3537fa84578b3ba82dc SHA-1: 08d9715c8986deda1b9a12ce33e5e6cc44792abf SHA-256: 5132d9679c55a03052ab0cfc2c40f84e9b6bf47754d99083984b86592f6a6829
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS upload storage, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, coupled with the use of compromised hosting, points towards a tactic of obscuring the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://mtecommerce.it/public/news/file/97716273658.pdf In PDF document text
    • http://bhttourist.com/upload/fckimagesfile/50383852240.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210705_F4B7E0F9E8A37A95.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3bb6d9ceb---4563556907.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/0d844cf8437eed590ecf89ab6071683e/lemosaguxudemesaponanen.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/gudasado.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c326463d6f2---40012214194.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/dalelapesuwij.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6387c5ebb28d9bab1ab23ec34986cf2d/zolagivisepatuju.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/fuxex.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/70177092096.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/8d2664d2ad197ad128c559906d0de65b/42034451762.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/g99f3dru8c8qi55ksj8hqf615j/vesowaxomavazopananejox.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/43587991223.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01c1946ff---40631483994.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/lufosuvinasobunaxutukosa.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/veberax.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/95467047212.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160793d2c2a02b---98450621359.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/61708258048.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/18022809139.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1a7c3b15dd151455ee6ca2ca243ea4c7/balugejikodejuv.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082570b686a5---46730455974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=international+fisher+effect+pdfPDF link annotation
    • 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_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 10668 bytes
SHA-256: 862f7978fba34091dc54b8c892e7b818078e5a961ea6c72a8ed18b772f49e28a
font_02_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 18640 bytes
SHA-256: 372d44eb986e733c39a77a731cdbc2061fa709ffeb410b8b20bc1a8bfd486c90

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