Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8048ac38cdb97e7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-28 12:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f5b13441e6db32dfc5e5a77b96220690 SHA-1: 7f8153005d4d7accee641e20d7a194b7ecddaf67 SHA-256: f8048ac38cdb97e7fe3ae07704180833a2a0352e8f50814885f0430e1f3526fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs that form a link farm, a common technique for phishing or distributing malicious payloads. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=best+weather+apk PDF link annotation
    • http://mxagproducts.com/upload/browse/file/21664466135.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/90922092727.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/48416177955.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613600ceee4e4---bejenobu.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/lafanefixezoga.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/16899370960.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/9270413015.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/61845441095.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/fajilawifawijawa.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145df4c7bf00---derirunivopewomuw.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d84453d94ef4051ec15ae526384e85c7/31714564806.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358f5b6f6ee---sabupodisopetasubub.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/zoxejaxebonirapefuwajet.pdfIn PDF document text
    • http://evola.it/userfiles/files/ratazumeligemu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138085423d38---75812018577.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/81567367097.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/37097896424.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f390bf3038---37362032565.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/donenibamimajupifi.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/vefamisudep.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/nomobujoxifupu.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/99386870473.pdfIn PDF document text
    • https://ambalatender.com/upload/files/23483097585.pdfIn PDF document text
    • 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_off0000b2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D4 10220 bytes
SHA-256: 2febe8bb5754e6030fc50979c06b7ed1f7e0ac8707f2ca2f323faf06ba2c6ed4
font_01_sfnt_off0000ca0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 17992 bytes
SHA-256: c574fe4172c9335fd93ea62a03bb857b2fe60995a43dbb3eafb74ec1d8d862e3

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