Malicious PDF — malware analysis report

Static analysis result for SHA-256 de863a8b34d55e46…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 12:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a040b0c39d1bb6c58c2669cad0aca83 SHA-1: 1c96a84a02cc2b0611f695fdf37e8f8cc8aaa0e7 SHA-256: de863a8b34d55e46b7cf55d52e8f5e730918cb6522bf043aabf0b0caf2fab692
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but containing numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://arte-salon.ru/upload_picture/22099822524.pdf In PDF document text
    • https://hankilfood.com/userfiles/file/20210910110534.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210918084917.pdfIn PDF document text
    • http://liyangah.com/Upload/file/56298007158.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/pubogom.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/filidon.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/97230624320.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/jevikiburinugaweda.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/nemeke.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135825d62fe2---rijukos.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/buzadutomu.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/latepesa.pdfIn PDF document text
    • http://rivucota.com/upload/files/48791450660.pdfIn PDF document text
    • http://ccsl.asia/files/zetufilajezigona.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/59348381834.pdfIn PDF document text
    • http://only-svet.ru/upload/files/jijuruzagaroj.pdfIn PDF document text
    • http://sro52.ru/uploads/files/61607818108.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/dorojebegafu.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/23198013833.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/vrvh44plj3j3qmcpmabim7v87g/87448532629.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/sopogopexojiw.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/35696301270.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613055066a2a8---fotilaxulegikawodib.pdfIn PDF document text
    • http://pi-consulting.ch/download/33329139279.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/50133535852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=gta+chinatown+wars+game+downloadPDF 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_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 17692 bytes
SHA-256: 74b0a0435307cde0118fa66b3a9b3523ed195e92a630913201af4992f059847d
font_01_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 10944 bytes
SHA-256: 89f90c315891f1c04ef367bf269877d15d4d3db596bd2a1d94dd8367791855fd
font_02_sfnt_off00012a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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