Malicious PDF — malware analysis report

Static analysis result for SHA-256 485b95af4941f8e9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-08 12:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9570d7a53e9af7d2e9f10407391432a7 SHA-1: 95e1a1f0630793f13ac8a415703b7fd8a279bf43 SHA-256: 485b95af4941f8e9ac825b6d3bfc008b74218c2a5623b9a27e0a735e0346d44b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with common phishing and malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=former+l%27esprit+critique+pdf PDF link annotation
    • https://lymfologi.se/anvandarbilder/221/files/46936910819.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16088f94d43c59---37181018401.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/36162150910.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/pazejide.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/79152988257.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/xawerizozi.pdfIn PDF document text
    • https://luminex.pl/upload/file/rexesosulijuti.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cc5df3ee6---88508351964.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/46020359091.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/nipewaketugoza.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/7632197807.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/puvepapu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/valinujubo.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/zugevatowujilunolexamib.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/29159798989.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/88279147970.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce6fb7e2fb5eca969421f0199469cd12/99326226567.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/82177196159.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/23260476477.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/65776222041.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/b2b5d7fd60b413694844733e42377130/85166001117.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/tisilozakavebanonoledeti.pdfIn PDF document text
    • https://isosklo.cz/uploads/paxijadaj.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/640674903.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_off0000dbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB6 10772 bytes
SHA-256: 37df50c7718a7bd7535f96fe3aa2056452a19309293bf0a792e2c6376c73dffc
font_01_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 18232 bytes
SHA-256: 93f2988040871447435a2625f118f99b994c098acd2f9d1c76786300b8d5897c
font_02_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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