Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d456439c4e88b4…

MALICIOUS

PDF

82.3 KB Created: 2021-09-18 08:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 072c2788a04a1d435625930426d188e8 SHA-1: 6769a6bcee9b18982d2c96a4ecb29a4cd248ebf2 SHA-256: 97d456439c4e88b4b0b1984f06560a2379ea59bc3177f655f6d1c24f78cb898e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these 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://drafthe.ru/uplcv?utm_term=changing+voicemail+message+on+android
    • http://mixline.ru/img/lib/file/wusuvejujizu.pdf
    • https://pellevah.com/upload/files/62392249240.pdf
    • https://chp-travel.ir/data/file/42771237214.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210915_70731759CEFA76A8.pdf
    • http://dataction.org/demo/dataction/media/sozavuxagagivajisekikame.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0abe2bacc---rebusodadetapi.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141692a5c66d---joxozomusidenevur.pdf
    • http://bbhshipyard.com/userfiles/file/84055887267.pdf
    • http://preciz.com/uploads/wysiwyg/files/69733150967.pdf
    • https://ofly.om-digitalsolutions.cn/upload/files/mitokajo.pdf
    • https://mptradingcompany.com/userfiles/file/suxoj.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16137637ea3ddf---gomoluwodaxajopija.pdf
    • https://hamzsabegi60szallo.hu/UserFiles/File/kakiparuwo.pdf
    • http://wxmx.cn/upload/ckimg/files/202109080758151033.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/veniso.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/xivabineguvimume.pdf
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/57748476650.pdf
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/xaperavolobudozamufis.pdf
    • http://rpsbchamber.org/editorData/file/31344931584.pdf
    • http://sonhanint.com/uploadpic/sun/files/202109131006247421.pdf
    • http://travelshops.pl/userfiles/file/fuvivubapiminiridoli.pdf
    • http://www.oomewatersport.nl/upload/files/5425394867.pdf
    • http://bn-biz.com/userData/board/file/vivegebus.pdf
    • http://kamienneogrody.com/userfiles/file/21725547055.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_off0000dd78.bin
c7f200824a254d49f236284b227eb84243b86ad27145b9a5149e514e902c6d69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 17584 bytes
font_01_sfnt_off00010a8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8A 16792 bytes
font_02_sfnt_off000122a1.bin
559862fe4049b6e90755319a65bbb0e3d0d81a38cc4c7e83f775f43872ed4682		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 10816 bytes

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