Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa56606664480ed…

MALICIOUS

PDF

92.8 KB Created: 2021-07-08 08:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e47aa93bef5697cc521b9f7dceee33ed SHA-1: 05e56356ac0bb2bd10b3afea29333ff0a31ce1c8 SHA-256: 7aa56606664480eda62f3341ab586c815216a2b75459dbe7a378f5eef4e5650a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/5f3fb96a2d73e62fce79d166b9a09cef/30706039731.pdf In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0e6100d2a099a84a60d1199051565bac/pogetos.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/39339475044.pdfIn PDF document text
    • https://alutat.com/data/file/vewujulu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962eb8d3e1f---30778341786.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607de23b0e132---takovafesusunak.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/27977128111.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5ed77d3f---26953844065.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/xaginetesofinumolas.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/30578992853.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/593cf734c999bb0e731912784b8b5bf4/34359821499.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/29977891562.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd33c8923d---legafexivupataxorulo.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/77809623092.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/u6mj1162v8g5tfhtdari7j8jcr/jiwasidotinibiforowirebe.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/tudijodo.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/35641203814.pdfIn PDF document text
    • http://geotersrl.it/file/86802395631.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/jupesesurarobofafo.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/19424781358.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/62873351973.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/43507214344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=business+gas+prices+per+kwhPDF 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_off00010730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10730 17668 bytes
SHA-256: a42355fc8d44d508905fbc5d75b530e70d289c653dc71c1ff198c17fbec21c39
font_01_sfnt_off00013592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 10720 bytes
SHA-256: f36f9841fda30d3f12a5b0d50fd51bdc4614173cc0b7b40907c46d9bff9771eb
font_02_sfnt_off00014e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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