Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf162fd081d9076a…

MALICIOUS

PDF

98.0 KB Created: 2021-07-06 08:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 14ce70d5f56c02e0ac1ab6ec7f2f7eef SHA-1: d5926e95f38184b480713577be68944b595b9922 SHA-256: cf162fd081d9076a22c0da23eabe37767ea4becff5deff6770ff6036117c8cdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=topology+of+network+pdf PDF link annotation
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/c8mkck12ah713bs7h1iv7ndql7/16721785251.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/27546877702.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/98626861557.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/7vkja5gcddkhslhumvgam5uh48/jadakozubatazuv.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/fibetaxabumekex.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-11/20210611061653693053.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/10187723da80810359b1454ce9803dab/masedaxar.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a033bca133---15974718267.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3f5a3113544fafec6abdcd4e43246dec/11859655782.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb8122946---papadifafovaruwosujiru.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f96410d24---jatexidutobisoti.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e5d4d3606---86428585693.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/oovavudvkpq1rfmbm30lc517kq/lizalatusoxurubowuxira.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/95494470443.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/vupebosenafegoto.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a51f81158bc---moxatomusapotutu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/84952f2d086935c25b5d8f2b61f95538/51312758891.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ak4isofemjrvj21438337bnsgh/47520744434.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac6d9ed479---selusare.pdfIn PDF document text
    • https://shidoremicrosys.com/media/meruwupuvukuv.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b9c28328672fade4958d93529c61a8dc/44048498617.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4683e64b3---zilazunaxene.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_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 16876 bytes
SHA-256: 779c4a8564e429b1d29c148b985fc755ce9561e755687bb137b72b8f05007adb
font_01_sfnt_off00014b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001634a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1634A 10508 bytes
SHA-256: dad5f9f7c088fa9fb58db05017eb38b869a0dea8d2cc48059e3f02ea2a329745

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