Malicious PDF — malware analysis report

Static analysis result for SHA-256 58baefc0cef9c771…

MALICIOUS

PDF

90.2 KB Created: 2021-08-13 18:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 169f007501199e80336458bbef95d94c SHA-1: 3da25381ef4dea6d36d2f2e5180fa52ac181d03c SHA-256: 58baefc0cef9c7718332d04ab2f32e44ec81b6377ae76b1efc5f9a48a898f539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, identified by the 'formcraft/file-upload' path. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crewmak.ru/uplcv?utm_term=qui%C3%A9nes+son+los+padres+de+diego+escalona PDF link annotation
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21566ee838---5731442453.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043bc7c44d---luxezofula.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/suxofuza.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2273e4733aa91d32b5cae521a7a742d8/garevexa.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/36996247056.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec6bfaf466---lokusizugobaxu.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/gorineseviposuw.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbb32a433---58977787702.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608920f9283f0---42600060084.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/df483b724e1e8897318ed3d4300cf4f3/38302519530.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/bafagiwi.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///20610353556.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa35b3727f3---mitediwenivenubi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sv3ub4udur7d9k7fvnqecggodv/18111823238.pdfIn PDF document text
    • http://computerdoki.hu/user/file/burosotoxoberugumezomi.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc233bb7e---rebekonozagunase.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/bb351ffac369d26f13c52551d1416f75/gibabazezizikovivorov.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/bikozoxoxuli.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1puk5iftulg4jp0gnkvre5otd5/55405504748.pdfIn PDF document text
    • http://atek-ent.com/upload/file/40222492970.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/40433301599.pdfIn PDF document text
    • https://studiorampinelli.com/file/62134403753.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/livifaredinaso.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/57543613016.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/47a96bd919795bed74a3d32c380aa394/todizunufalasup.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_off0000f64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64A 19200 bytes
SHA-256: bfab11ab3920449e040b479c6e9e984443dda4152a80cce6c0bdeda39a38c330
font_01_sfnt_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 10904 bytes
SHA-256: a9b45fdb8e9338a65724063ce404785a7ac311f957ecbf38940b2d459f1e3547
font_02_sfnt_off00014026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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