Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6af8905d0fa4a1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 19:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 630498ca1039d1b0804a8c837067aadf SHA-1: 916a2e7d9978c7e92aa4d347e39fd8e7f47b7d76 SHA-256: 7d6af8905d0fa4a10db8652b18a7a82fb4a55a5585f4bef7622e1b34589afcef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised WordPress sites and other disposable hosting. The presence of multiple external URIs and link farm indicators suggests an attempt to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/21edd42356a2ef1232d0bd88c61111e8/57765154886.pdf In PDF document text
    • https://ksboutlet.com/file/files/74536944579.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4dac45a41---46905993952.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/wevege.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131262884ff7---xujazejip.pdfIn PDF document text
    • http://metallpress.info/files/lebevewavogozowedirirote.pdfIn PDF document text
    • http://precisao.net/files/files/tifoxajobomidofe.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/46715712980.pdfIn PDF document text
    • http://3asoft.vn/img/files/liniduliworewam.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/13640940753.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u9db6i07c2v4ue1k6hhsvpd2i3/gubaxoxuwudotupubapululi.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/gajezifafodimarixil.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/48587010634.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/98446706155.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/38617879089.pdfIn PDF document text
    • http://voijin.com/userfiles/files/24215886541.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/mewituxaxumuxifirefezaji.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7cb04a83---52238764518.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/29537085962.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/boriban.pdfIn PDF document text
    • http://darec.sk/files/files/82258971899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=exchange+contacts+androidPDF 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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 17412 bytes
SHA-256: 69bc0bb8526b6444d29341ed2f62713048aa6accbd50e5ec64f2f7b32a1fe0f4
font_02_sfnt_off00012df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF0 10688 bytes
SHA-256: 03e7bda84763b73e00f3d746c7db3feb34bcaf4903f83c64987a5b1c42a9b437