Malicious PDF — malware analysis report

Static analysis result for SHA-256 f08fbfaf150e9fdb…

MALICIOUS

PDF

81.1 KB Created: 2021-09-06 09:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 479639903c847cca9b39d0bd58422b40 SHA-1: 10e60d903c0b299c54946ffa93a429892b50f151 SHA-256: f08fbfaf150e9fdbd5b3ebb5678f1275e529ddf518c3a8672e13fd57c54a695b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the presence of external URIs point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=tutorial+rubik+3x3+pdf PDF link annotation
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/tagasozeluxixisaz.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/944236e1f98c4d2be690b92f59f6a5bf/wotibevonom.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210906055056.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb528fa66---lotasixiponebujixu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/45b296228dea40dc132e0edf67aec5c0/papibinavikenutitonaneb.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/90062976461.pdfIn PDF document text
    • http://rafaelokazakov.com/file/dunerasotepapibap.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/150is5ce4d8lt67usocdv9bl0s/mawibivijobaz.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9e6bcedf---15052015888.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/1da6fb9831f6cf91ccdc2bfd93db5b1b/xujelekiregulutumujo.pdfIn PDF document text
    • https://abeess.com/userfiles/file/pumigin.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/96321604021.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/99055524748.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/susigas.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/ntutfq7c5dffrtuv2mgdkj41c5/jalevotodu.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16129b46c80e1d---risibenakuza.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mewuw.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/lesegoparijagakoxomesar.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/0571ea04782138ca971101f59324edd2/lawakomuxose.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/nakivin.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/nelokar.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/23257511994.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/19739059956.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/zatasosuxapu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced242158bc---42030206303.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_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 18160 bytes
SHA-256: 77b5b6ab29d96743891579927537f15765a5c3be794b56bb0eb939da79c8a3e0
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 10656 bytes
SHA-256: 23dbbed9a928dae4d815f2586c3d6d9dc4a3720be33d4489704d45ce6812d2e9
font_02_sfnt_off00011f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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