Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01cb52ae4b291f2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-04 14:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32a5296870c5f4734fd0328d3fab1926 SHA-1: 2f199694532e3e1192addd4a77f0c155756ea273 SHA-256: b01cb52ae4b291f2c37b33dad920b46b00a026f0dc0961275959a895f4a27784
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this, indicating the document's primary purpose is to host these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=revista+boticario+pdf+2019 PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf5e673bd---51779390130.pdfIn PDF document text
    • https://noddy.nu/images/file/kuwupogumojerepowazigasav.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ad91f9eb4759ec7cb490baa009d72e55/38924539638.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082b19509e6e---34272432789.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/18011b9a7640fd730e3f3381d246c35d/ruzopotipezejowepujo.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/bubidiza.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/jifopuwubakinit.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/50420352282.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8610d1d154---12523571411.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108112149424705.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070486785786---78719998993.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071cfd024f9f---58293363660.pdfIn PDF document text
    • http://freeorden.com/media/file/zorenawavuzosikigojuxoz.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/52225344968.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210621165548-luwunasaj.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/vewitagetajetabigatika.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/cr971psmg6e4boas6ltsbeib04/mawuzikegipodim.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/73093120822.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210704_B53ECB9ABAE0049A.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/latomap.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/funorakoritanevate.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/lativamido.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_off0000df95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF95 20216 bytes
SHA-256: 253afd3efdf087fbfa9959c816535e00b3891f750ccd0e0aba94fe79eb660b8d
font_01_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C45 11176 bytes
SHA-256: a6704329a5e25bdb3eb2a27d211fcdfff15f5df42598e5c1ca232650745cbf84

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