Malicious PDF — malware analysis report

Static analysis result for SHA-256 956af6e02e7ec294…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 11:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 67678b2b42ef3b60d9181d3157f98191 SHA-1: 936e4791cb47eb2d48a740524105a8ce639fd555 SHA-256: 956af6e02e7ec29454cc875ef0d84f955dd7aa79085d8cf45a7be12f13908f92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

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://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3a5390e3859933e860ccfa66562e6be7/63444778856.pdf In PDF document text
    • https://akonis.ch/userfiles/files/vezagisogaj.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/76057847414.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350aa2285b4---sifog.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/livupefol.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/wobavalofepobimujubuge.pdfIn PDF document text
    • http://hanifeugur.com/image/files/vugusozidabirirebuk.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/77a960fdb230140459db38524117b4d0/28219395819.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/jujipakupufer.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/56284619978.pdfIn PDF document text
    • http://kes.org/upload/editor/files/92392989087.pdfIn PDF document text
    • https://pbanerjeeservices.4digitmagic.com/userfiles/file/lanifulobitejutinusudak.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/tawosazadiduwes.pdfIn PDF document text
    • https://digicpictures.com/downloads/79132248018.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec90761468---fidijonalez.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/juzulesutuzudarimojibu.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/xavorotuwetar.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/vutotakunuvufo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/bilenixe.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/33140152725.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/ripanaxowegokozawineb.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/39803774254.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/25ccdd232883d9373728121607fd0d47/933244197.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/popupilenago.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/gotitowemiwoboxovinineb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+emoji+makerPDF 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_off0000b4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B9 10300 bytes
SHA-256: 3923ccd0922c469c9683b3f1a868193cf70a6bb623e62c4ed7ecd01e5e69487f
font_01_sfnt_off0000cbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 14568 bytes
SHA-256: 73016ea65d4cedbcfa561eab7e7f3980d747c8746d241873505f6b451b1abbc3

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