Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd2f40231b8a719…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 21:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b5bac35f8cffe85bcd9c1e25fc44629 SHA-1: 18f27a82a98e8b4550618ec33c80fb179b4c3451 SHA-256: ebd2f40231b8a719cfd0a6bcc45d02b5f331fd56ca9dfea35784b0913281c683
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or using disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://aeronautike.com/userfiles/file/31064882988.pdf In PDF document text
    • https://briljant-maleri.se/UserFiles/files/83735050903.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba80d053c7---50650721103.pdfIn PDF document text
    • https://andrejc.si/files/file/ladejugegu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/8200244384.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11fb9fb99---786879868.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/024fe2484f98b6d7806a0809fe470a7f/wapaxofedukofesu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd39c09003---bironuvuxuronazavovoramo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/506d29d94c85f0670c994c21b1a053d0/32825094061.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718255cface---90460239050.pdfIn PDF document text
    • http://championsview.net/userimages/dilalam.pdfIn PDF document text
    • https://giustofiori.it/file/govitinesonufurujite.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f35e37d5f3---lupodumitopupemomateli.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608591f11649b---koxajixelitusadel.pdfIn PDF document text
    • http://sakem.org/userfiles/files/gisid.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/vejulokukiz.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/walagotamip.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/nufosozurejawedidi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/28080803011.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/83486254402.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/97228204583.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wupiravadifirodojakuruf.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/vddrnjk0jgjbojl1tj05d5i136/51992649959.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/050iukm1sbpeadqrs31utt1aij/3986090350.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/78582563479.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/jawosigexefo.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/13401060987.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/47735323170.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hbr+10+must+reads+the+essentials+pdf+free+downloadPDF link annotation
    • 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_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 17612 bytes
SHA-256: 04c86bf23d5f454fe4d8f663a645db6ffebd5ff8356c219fdfe48cac13c66691
font_02_sfnt_off00011114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11114 11256 bytes
SHA-256: 777c3f2c3771bac240f7590a816885a9c8caf7b94204ee7f839575cc73ed1010

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