Malicious PDF — malware analysis report

Static analysis result for SHA-256 da64404f0eb8b5e7…

MALICIOUS

PDF

70.6 KB Created: 2021-09-12 21:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3ce686c6775d9070b879099d923825c1 SHA-1: 12b6bb06e280c9372b7ebbf1be7b18ac23ba895a SHA-256: da64404f0eb8b5e78a619c56557c5b87c573039eb9538baecc092a2020bde37b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=wrong+turn+7+watch+online+free PDF link annotation
    • http://happyhanool.com/ckupload/files/50318778507.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/tiluxozuf.pdfIn PDF document text
    • https://ottopianos.nl/files/sevazeviniranesiru.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/mokopize.pdfIn PDF document text
    • http://strandedtattoo.info/file/gupuzusigen.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/xekitewad.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5ffb21c8---51617039195.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/98251171412.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/58019164950.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/wudijobagijegoba.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613148c0a1118---lovomixedaronologufob.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/73404426537.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139700f529ca---mujukil.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/xiduwawotigagujoruvanitax.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/57114284250.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109050307297672.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310dc45e001---sumitig.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/64951529381.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e56e292893f28c13bb11f0b7985c29fe/12786858505.pdfIn PDF document text
    • http://centromp.it/userfiles/files/7598377504.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/62904128429.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/zijuzivazogi.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/16684041792.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/mubiguxodozogud.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fa514f5f6---xofimi.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_off0000b46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 10676 bytes
SHA-256: d4575ff6fb1a3ce2ceee8098ebdccbdf5151c4e4c9e5e5542eb97002f5a10b5d
font_02_sfnt_off0000e50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50B 15532 bytes
SHA-256: 97e4b620f828591338771e016301d890ca16436b771938dc650b9d1693e52231

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