Malicious PDF — malware analysis report

Static analysis result for SHA-256 7995e3cf7cd30133…

MALICIOUS

PDF

99.5 KB Created: 2021-06-27 17:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ead0f93ca7e5cb4af23ca04abb083498 SHA-1: 9271034e6471f0135553f15bbf68213ddbe2883f SHA-256: 7995e3cf7cd301331ee30bd8fb0d526058510d456a67839c58a4f728edeaa929
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised CMS upload directories, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, not containing user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fdb3298d---nokupixogiwuzus.pdf In PDF document text
    • http://metrokentakifinan.com/resimler/files/zizuripenunupimutoje.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/9419300c22616a8a739f984e35a46da2/bepalugixirosufivegitu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4bc4ccacf---fofejewunape.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee6359afb---vezoxatuz.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/bac8fa5e386ecf220186492912019beb/nisobumuxipixavutovube.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0797d03ad---telubulumifodo.pdfIn PDF document text
    • https://attack.lt/images/files/loromez.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/614c0f35c80efb4dcc0731e4e0e172d7/vojobotis.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/io1095bgmu1ej9u5g8rp7qkgs0/97286605019.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/veruzupali.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/64914473acadce81b926e41745f70aa7/xibosiwaraduneluzuze.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/xupuluwopukonisamiduwozet.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/5995793325.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/42728121417.pdfIn PDF document text
    • https://mattress-leader.com/media/21570541341.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/nigedasuvabemupuj.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f82ebc22---6827065383.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084688c0bcd5---87984846345.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/juhg67jft5s6eb47cg6tgjlu8s/42950988351.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077378f76908---50489683632.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9cb9b81f7ec0b8f0187ad8e7e367088e/1060107501.pdfIn PDF document text
    • http://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/pevinol.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56cb4683d---jovukujesamuzore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=linux+http+snifferPDF 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_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 10288 bytes
SHA-256: 7c12935f7fffbe633c0ee6bd67c00ec539dfd45ef409c6733b4314287780dba0
font_01_sfnt_off00013734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F46 18852 bytes
SHA-256: 0ea3e0cb9d6adfff5474b8f2e7ca48d575361c0c12926a965334703d5295a35c