Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ffc40d61abab9c…

MALICIOUS

PDF

89.2 KB Created: 2021-06-27 14:24:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 49ef7ecff592448539a3a75c08a88f0a SHA-1: 8681d8c601b0c25bce26c8bb046acc6597ae6d7b SHA-256: f0ffc40d61abab9cbdd3c4d04dc4cb596045e3c89dd8b6cf06bb8a9a9857deb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://datev.hu/ckfinder/userfiles/files/lonufekoko.pdf In PDF document text
    • https://mmagame.com/userfiles/file/gifuxuzokefemab.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608935b925b6e---13912915576.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/0sarc297oh4cgalbs46pn3s4lv/95551323556.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/p5s5a9q19u8krgbt3u9dnivud0/62979772564.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/05bc80e1cc537a5d04666105eda9a069/bipetekawidijomumepobeneg.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vobmcgas82djcc09brc0shpt07/tuzodivekivegojaxevap.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/c59bnsgu61rmuh6uanvndbdou4/59922125549.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210617213749152.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/95912594269.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/p3u9r3gdauekpe9gemj2qhjpel/niregaxi.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160965b50cbcfd---paxiberugirimuwenenix.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/2ad846adfbab85621a2a575a6fa9c52b/26959170650.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f108d129---konut.pdfIn PDF document text
    • http://goref.ru/files/file/19436255656.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/44i8q5qmpaf4fage607vkcigtm/zalomulexuposuto.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/2ff899f1408c920bcdf190842b03a3d1/sadazibodejuxarige.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160767828e233f---2050941823.pdfIn PDF document text
    • https://ptogel2.com/contents//files/kidux.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/zezoguson.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/tfebrdopcicvk48vug29v4gl55/rizilizevonamelifixoxif.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/46496086034.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919f289a0af---lezimedupojoseguvewos.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19908156a371aaef46bcea2180df4eab/36833859513.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/054091fd56af56e7130078f769ad455f/kuzerosesi.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/juzomaguz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=benefits+of+being+an+engineerPDF 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_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 16628 bytes
SHA-256: 32a8f55be04e009af4802e293eda2d6ecee44fedbf23a04dd4499c1ffc1c6dd6
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 10536 bytes
SHA-256: f80570d4540ef69d666bacd98d15a15298d089bb8d338f4de3c8eee92e378dc7
font_02_sfnt_off00013f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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