Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8faf8205bd2a8d2…

MALICIOUS

PDF

90.1 KB Created: 2021-07-09 00:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9fad4375dea41914074527befdf4a2cd SHA-1: 164732baef4f30b60d8c016bd20dd5e4c4200ad5 SHA-256: c8faf8205bd2a8d272831598bbfe376109c4ab16d6d4e26db594aa26c77c3e34
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the structure suggests a malicious document intended for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.2376

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=carbohydrates+with+one+and+two+unit+structures+are+chemically PDF link annotation
    • http://onlineticketreview.com/images/file/rumupepivalumi.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/igftom3us3tm6om1cff2447a8d/boditeguwuwoj.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/ripagutigojavurejaza.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/90751218311.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a3204265---xuludeninijiganosopafevo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609358dfdeccd---55171336743.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/4ti5fhoesh6bshs548pa2bd2dr/16459744999.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e493813488---99832502755.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160923eb6ca936---lapezupexopajozalefer.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/nafumowazeserigajab.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/26853855579.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/401bcb4036fcc9fcc30a03f54f415eef/79678746278.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/f51dc12d0fa23f4d906fef673b4a59d2/zoderabimofodixejogavijo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a424138028---76087175832.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de94a324bb9---rubefejovunowawesomod.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d7dd69a7---kixikepekurerala.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/8eed6e6aa7a372098414debbe1301e90/92159761174.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcfe07174d---lamazoburogitanum.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/18a300953e1b0de690bbefab45e15dd7/jesazisovukixolumuvuba.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/76012026674.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf3b1df51---nitebabuvivibepokopira.pdfIn PDF document text
    • http://houselandia.ru/files/xigabewapugasiwemuw.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/8707d15b8ff059ea1a5a28e1d1c1277b/35900343527.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/fozomezewibimozonojered.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/tvbk2isap08fk16aak4asaesrl/goborusemisopokukazexegav.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0634150af---fukogez.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/demolu.pdfIn 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_off00010863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10863 18200 bytes
SHA-256: 90608b2cfbde90f5af3f1976766a9ea625217a99ccae0d511a18c7ea0d997177
font_01_sfnt_off00013836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001504d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1504D 11108 bytes
SHA-256: 1f9f37edea36017b4905f49d169143b26b83737e7ea50abf9df15b79d393df99

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