Malicious PDF — malware analysis report

Static analysis result for SHA-256 3791d1f8a41f0d36…

MALICIOUS

PDF

88.8 KB Created: 2021-07-06 23:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b93de513505e92c2de9f20c685b68d6 SHA-1: aa77037867b67e6982f8375dcb0d0ec18beee43d SHA-256: 3791d1f8a41f0d363b5cf08bcb153eefbc30db429a507d8d47a4b92b002b5ac1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://queure.ru/uplcv?utm_term=meaning+of+octopi PDF link annotation
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dabeb0333bc---kitijukulu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tha9touu7hinmpfmaamhleiifd/voferanivebukofupef.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/3bc08ac0d6328f0411da19f8324e642b/38510871929.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/tirt608trs6prni9ig7eb3hvni/merakibusobov.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095b7f4285e1---88647754527.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87f390d42---32999640078.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/80470459861.pdfIn PDF document text
    • http://mdc.ir/ckfinder/userfiles/files/33628445486.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/04b38fc16b213821ce2ed0f6f6332503/wagamizutokuwudokobisedal.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/okppa0fbd5ijka9r0bjj5l1pcb/melivewamaxexaxejajiwalug.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/57988260549.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/27938870781.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1bee5a658---3713450335.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/33ed8b82454f7cf2919680a4d39d2a68/kewemijoruzir.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/75018515237.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/62798cc10e3e44388e0456b063c9aa86/13123109860.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa615b914a2---26367287385.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/jisupidaduxukomojuxa.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/nukejixam.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/tejurudepenemub.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/10853555720.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5icd66vk8b3l046lb3mmku4jkj/11581180766.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/94858532492.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2pdrlh8o7nd0mii0oaf8toe56n/dijoxuniwuvetopu.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_off0000f67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 10332 bytes
SHA-256: e6bee5ba5adea83444940d89ffc9db7647444776d7edf9767676e7fc5fc1a548
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 17892 bytes
SHA-256: 253a20b571b9e8c6014dfa7477db5bf3fdc389dfa3c7f81c83cdc3b26dc112d4

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