Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d9cc61a9987b64…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 13:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 870e1f5e74ef5d6daebeb35e7a6e18bb SHA-1: a4d1a7985409d40b9c2e3390f2483a3f448b5214 SHA-256: 01d9cc61a9987b6428fc607a2cc7479169ed5726a08fdf335e622f5267754efd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ca77bcaecd0c1aed5de08db7e85f1f10/64994688823.pdf
    • https://sharadsangam.org/UserFilesTwo/file/77812502436.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b6b6af215---89115126265.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc20f0e5660---fagawaluretu.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/nnlvn77jl4lmetj1fotuco5rg0/89061614134.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fbab1068b---72138865073.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/98b63223c3c0e5682f54d04f0a0e44f0/65818651335.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1f655faf8---13996881524.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/dfe86fed155f4d40ed345dcf1da8005d/vufikar.pdf
    • http://yaqeen-eg.com/userfiles/file/86361754527.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160872f8e25565---latepim.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b4da3ea93---36377763149.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33315dd4c---ximigigajidomuxalunon.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc18c0313b6---71888551234.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=man+in+the+yellow+hat+girlfriend
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 16792 bytes
font_01_sfnt_off0000fc9d.bin
768b8e3e24f9feaf54aafeb44cd27940f05e9e4c0cdba5a581b08b8df23f2140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 18444 bytes
font_02_sfnt_off00012dc7.bin
5e16e8203303abfa63546eb98c01e84ac5527eea7a7f94afa0fa83c86d31ac03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 10656 bytes

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