Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bbc538eb1ed69d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 10:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7293c5767cbffe9f3b017bd5059ca8b5 SHA-1: 968865a130f8315b2f06963cf80acb562653af67 SHA-256: 91bbc538eb1ed69dbfffaa5fbe6abefe1997bdcc538d08c3d6c1b0b12c0d679f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary attack pattern involves luring users to click these links, which likely leads to further malicious content or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=pasar+datos+de+un+activity+a+otro+android+studio
    • http://tdbakademi.org/userfiles/files/88052615784.pdf
    • http://studiogallerani.it/userfiles/files/49592394768.pdf
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rudinenetisokoxilevabev.pdf
    • http://gocoachfox.com/userfiles/file/jupotepijoradag.pdf
    • https://conrays.ru/f/data/mubaxexidivalabarade.pdf
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210919_9D6C84E5C302BC5F.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d20d3a9562---34179141269.pdf
    • https://ltes.tw-goods.com/UserFiles/files/41133103316.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cf0ccf6fee570433c3094c42f888e31e/visokefixozoponeja.pdf
    • http://www.mariabeckmann.com/fotos/uploads/files/85600318123.pdf
    • http://siblom.ru/files/upload/file/zubikuxif.pdf
    • https://babetravelling.com/ckfinder/userfiles2/files/lagexewekelalid.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/nabijawapani.pdf
    • http://ageddfjtj.pretty-match.com/upload/files/vugisewizazurivazan.pdf
    • http://murielbellhomes.com/userfiles/files/40518904808.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/n9sf9vmq7mn1s0u9eqb6oj7fsc/rusubunatave.pdf
    • https://aletihad-group.com/userfiles/files/96082810782.pdf
    • http://redeyeldn.com/userfiles/file/tezozibujito.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615030588f4b3---tuviposogewukudoluwom.pdf
    • https://www.vignolaweb.it/ckfinder/userfiles/files/wejetoranelevitib.pdf
    • http://321eastern-thailand.com/userfiles/files/77549038000.pdf
    • 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_off0000af6e.bin
e3529396abd69121aee373962d78acd2508c59221f7a147081fa47520822d978		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6E 15928 bytes
font_01_sfnt_off0000d779.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD779 16792 bytes
font_02_sfnt_off0000ef90.bin
0eadfb0bb289f261e12745ddd40754608a9e3b248c5e2131785a02e0113780a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 10600 bytes

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