Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c641235f657083d…

MALICIOUS

PDF

110.4 KB Created: 2021-07-28 00:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: cd08bf90bb8392f779d1944578bbdcae SHA-1: 6b99b40e611a5f55a56626262fc9f50044194c46 SHA-256: 0c641235f657083dfc8940988e5445199f097f24457a34c8d9e885cd223c68dc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a link farm pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e3508dab411---42101142876.pdf In PDF document text
    • https://tecnicadovolante.com/images/file/23293412483.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/bb8ace97c13b53eaaae2772681b10bc6/24957414047.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0dd55d09925042c10708d0ce888bbc5b/43416559078.pdfIn PDF document text
    • http://africareview.in/userfiles/file/folunofumanomipiwuxuw.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608406eadc02b---91854748838.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210727134554.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4c01cd6b1---50628928010.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/wonekiterivofijarejiwu.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/37121175804.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f3b7d6ae---93765641081.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/f3bf143b93a8402093d4eb3315b1321b/90688816461.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/eba4620071424c6b27af229e7697735d/75620816345.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db97b1941c5---naxagok.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/66bde8bdd50552de3272cfd893dbeafb/1386932010.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/75bca2e71dd939c26a18418642bd10c7/jivozumitedusewokiju.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/29779293960.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/felitaxadesigiv.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/juvugefoxe.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/75500330312.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/bamejili.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9af8b3f8b35e679b9ce39481b2e81a32/ruguxifogenapidud.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ntkeq7fhvr16tfag9r4trt6ti2/22090792944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=teenage+mutant+ninja+turtles+1987+season+3+episode+5PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9A 2616 bytes
SHA-256: 327c9317bc7d9cc360047f37a6451cf60c99fa10bd6ae963acc863cce857158b
font_01_sfnt_off000146a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A1 11712 bytes
SHA-256: 1d61afbd1207b389cd0ee8827123585b0bd71cfe825f21bd5787f65704a034de
font_02_sfnt_off0001626d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1626D 18356 bytes
SHA-256: ba7f2271debc8ef2c8f86eef179a23225b241d8347a11ed38f01142a9a80eba1
font_03_sfnt_off000192e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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