Malicious PDF — malware analysis report

Static analysis result for SHA-256 a764bfba765f7446…

MALICIOUS

PDF

87.7 KB Created: 2021-07-10 06:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3d7fd719b6fb591cf0d86a5148ea3b6e SHA-1: 04c9ceb9811dd8fb412db78b29a213ec774044b7 SHA-256: a764bfba765f74467eefa459ab3eedc4458dd150761b4575e9af0930b9c3d20c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://acrgroup.nl/userfiles/file/25685189665.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcece28707---jonet.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/95379952425.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/kokodorofofovixutejofe.pdfIn PDF document text
    • https://airbays.com/userfiles/file/39260987574.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/9qcu8t28veka5abp46828o61a5/deremim.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/h6s9jrat8u72b7oie0rkc2plt7/97047283439.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5c81c72068d1e25a91497ca0d136466f/24563756677.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075add606a17---76075194299.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aa7c1d235f3ec15b33b646ec785dcf53/masasetal.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/79034202210.pdfIn PDF document text
    • https://go2germany.ru/files/file/nelevutiwewojef.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d6b26a4d---xutenagikaver.pdfIn PDF document text
    • https://unosms.us/userfiles/file/83162242996.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f4366def5e29c93875837d6eac3e53d0/75123577824.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forurivonumedegas.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/66905843870.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/lefezexejipetemed.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/18017504018.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/93504260895.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8edb0315b2f08eee3e55b5f8101a1a85/40582774785.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/6120049028.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/70407179373.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7a85c6a82a049763bc069808212cfbaf/jijirida.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608565de62322---38061556929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=simple+inspirational+thoughtsPDF 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_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10872 bytes
SHA-256: e91049b880a1eb38075e0ebb217c4b145a244de346b76c5dc36012a30728b6e2
font_01_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001262a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262A 16664 bytes
SHA-256: b22ac3c4e44c1faebb5c3b02dfadc06c38a898d8d94f55fc4fd71b434e5762de

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