Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcf1bd07df50c2b…

MALICIOUS

PDF

73.8 KB Created: 2021-09-15 17:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e29c692f7423d3abf5772817b759bbe SHA-1: 9d63371a9c70a33654038c7f28f9766c7c6d1d28 SHA-256: 8fcf1bd07df50c2b16fadd5a253572642a304c372f73b36e6a5d1aaaa0380ab2
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 or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern observed is the use of malicious links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kleinschaden-expert.de/userfiles/file/71662403240.pdf
    • http://sintellect.ru/Repository/file/14003028026.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613889fd0437c---77543801516.pdf
    • http://imosa.asia/uploads/files/202109011031588524.pdf
    • https://tsolisp.com/files/file/98708600265.pdf
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/51779464248.pdf
    • https://detectagsafety.com/ckfinder/userfiles/files/93056973129.pdf
    • http://masonhn.com/d/files/95020311789.pdf
    • http://copingconversations.com/userfiles/file/25739679480.pdf
    • http://short-story.ru/upload/file/48460391037.pdf
    • http://acm-medicali.it/userfiles/files/lanavarusab.pdf
    • http://teleinwestor.pl/userfiles/file/kabidefelezesadipusit.pdf
    • https://ccskin.com/geektic/files/kubozujamatevupoj.pdf
    • http://morakothotel.com/file_media/file_image/file/37048956546.pdf
    • http://metall-press.ru/files/pumum.pdf
    • http://vidiniaibreketai.lt/userfiles/file/nepasuked.pdf
    • https://laflammerouge.ch/userfiles/files/niruwenaloliso.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f230fe229a---situfizewoxivozujazu.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b5445e56c388d7f248c9225066fc247/30146309527.pdf
    • http://banglenhospital.com/UserFiles/File/6372056760.pdf
    • http://didopack.com/files/51781356021.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/51621007697.pdf
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/pabizugipuvidawilumugu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=material+design+menu+bar
    • 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_off0000baf6.bin
10b0e25b1209b1c3e749f2ffcdc89d9a91900fb8c1be144398d8ee9dd2eabef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF6 17464 bytes
font_01_sfnt_off0000e916.bin
c69466c5097a789c86729d889173a6ef8166dc6d6b0af9c39c27b05e07309793		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 10704 bytes
font_02_sfnt_off00010165.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 16792 bytes

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