Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64c4f13d162a3c8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 09:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5c0fe14c85fe32444a7ae451053671d4 SHA-1: d8795cd8172d09b7dd61eef9e44b7c5c10a04c46 SHA-256: a64c4f13d162a3c8175eb67aec7659a2ce1e84b7adf2854920c14034c3716af5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. Heuristics indicate it's a link farm and potentially a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irlanc.ru/uplcv?utm_term=work+out+mean+average PDF link annotation
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/15318bb5a8ef6e0bfaf81fb0e38a1247/pemewojusojijerodofesaval.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/44426504997.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add49319249---logilel.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/galem.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/92000674977.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/zezapoma.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/82831379409.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/2717864903.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/v5or9vs6vnlitj7ec14q05ts81/88536596461.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/gonosopex.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/36388344872.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jepifesalisegog.pdfIn PDF document text
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/gifedifivedudesatidive.pdfIn PDF document text
    • http://proxima-design.cz/files/file/regorifujafe.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/rekigosifuzas.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/75004794461.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/nafotigijo.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa29d3c9b6d9fca77a628fffd7dde132/kadozigipevagenal.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/lezegi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/39176115198.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089ae9aeb82d---42794418420.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/janidukenemolipusigojon.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/81799509152.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca93d9493e---tineloxilavalazedo.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/muleju.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_off0000c713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC713 16140 bytes
SHA-256: cfdafae50610e19041aa061b6a8720589fc82ea48453bc5fbb2b49f2c8faa06f
font_01_sfnt_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 10396 bytes
SHA-256: d5a2aade108c7aad12f103b4e742066d169ce57129673a0f1188462c72f4ea53
font_02_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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