Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe7e735b8c6d6a0…

MALICIOUS

PDF

80.6 KB Created: 2021-08-29 01:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 597ee5acd3ef794b9c59cc1468df7605 SHA-1: 63e95e6042f054a2ad54e096879a9fea3a5232a8 SHA-256: 8fe7e735b8c6d6a0170a0111d328a30fe14eccd34fc19af4be9a691daec79e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and link farms indicates a likely lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://drafthe.ru/uplcv?utm_term=8+minutes+in+seconds PDF link annotation
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3f5a082dc502c78a377cad99c0d0e3dd/90052967558.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/fafisudibo.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/tesazamidolodilixexegafa.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/12893196249.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/kelolakafegakerojobatazok.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/91374958320.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7bf662ebd7b1eb6a99168f2478f2570f/tujekufareko.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dec7fptt3i4ga4h00uk9svl4i5/bifijoj.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607143cd52a54---ziluna.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ff97efaf6---59347320487.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f1d6bfc5d1fc40b40395ebe711d5dca7/8851685289.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/5c1507986eb23df04c695e7c46327740/39914286294.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/87865101155.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/44026753088.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/xedarujaz.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/52160095742.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/pakixiwili.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/cc6a6237bfb13df4ca3eba0acdf0c6a8/78916173626.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/vagabezufekupobadiwopiw.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/dodejiwezuwapixaza.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ee587856ba1765bae60a2323ef6a3549/76142375228.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/fumavekem.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611841957286a---17401945013.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/japopikukuvejadebaj.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/75acfc8d5d6502ec6844c13a4bcd60d8/xalulozogutinaduve.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/baruzefuvitediwamasox.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_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 18104 bytes
SHA-256: 71a81609dbb1d2e4ef13dc54d29d44ae45e4c61fff8eb2ff0d9ba31cb0db7d73
font_01_sfnt_off00010527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3E 10432 bytes
SHA-256: d020fbeaa7b8053d15f64dfd99927a103083eef8453177145fc4d007bf868795