Malicious PDF — malware analysis report

Static analysis result for SHA-256 05744f4e3051f7bb…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 03:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bf26e2fa1081f9302baf8e3be9773ef SHA-1: 2529a36af1ae7039eebaea7b4822ebe000fcb2bb SHA-256: 05744f4e3051f7bbbd3032f2c433932facb906125c916bcd02735809cbcc4e83
156 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/38eba3f40b15d00d4af79b6ec647909e/lesapowetetetonefowu.pdf In PDF document text
    • http://huyminhplastic.com/upload/files/fawozakod.pdfIn PDF document text
    • https://go2germany.ru/files/file/16564403217.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/kexixodowawutugemudurimi.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/mopuwibavawukuwajogibaj.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/62581300405.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/sagijimubefuj.pdfIn PDF document text
    • https://network-italia.com/file/nenipoteditikapaxonexar.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/kapevojewekavitosenir.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/kafisujexuxoziwawa.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375950eddf3---42971125843.pdfIn PDF document text
    • https://alkoplast.rs/files/81190980875.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/wunilalejozumakiz.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/6403014873.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/24395212024.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/20191238871.pdfIn PDF document text
    • https://robodom.si/files_vsebine/gipaj.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/xufija.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/mopatozakizel.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/22608762457.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614280fe1b2b6---69599628352.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/60355720939.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/42573652065.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilelejuwotosip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=barre+de+recherche+android+studioPDF 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_off0000b97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97D 17012 bytes
SHA-256: 718ef78142c33c3cb3f9138d8a7aee2bed8d5874b3097da3a9a4e4dccab2849d
font_01_sfnt_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 10572 bytes
SHA-256: 33e565671e080fb448270d8505aee497e82189a17147e22cb1d981d185da4691
font_02_sfnt_off0000fbd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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