Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb335b4bd523a75…

MALICIOUS

PDF

91.4 KB Created: 2021-07-16 10:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f73e1ae6266e9a19666308fe2fb7f6b2 SHA-1: 187a5536204690b9e7c049ec389fe2a300fb7063 SHA-256: 1cb335b4bd523a753d54ed16c435e7f28333624eaf116c62bcc764b4aeb0f1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://wastran.ru/uplcv?utm_term=roman+number+50+to+70 PDF link annotation
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2bcf7d8a1---fawanomezer.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5bf985774---susubedipemuxodum.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/kalexibidem.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/25002902964.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/53617722512.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/80604413351.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd831723725---fupisifumuturodujegegas.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e31cf04190b5ace8dbbb21ccf1f62080/sidakezuwifabu.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mudejezipila.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9a69cf88---71750910797.pdfIn PDF document text
    • http://aimic.com/userfiles/file/dafurana.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b8bbbd1ed3ef77e7128609665f6b3d99/rekimajugomamajegobujitiw.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fujabagozurabanikupuzedev.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/wedejodoraxejivalado.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/e2610f136a5effb93adb557cfdef9eff/guzatowurunelen.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210509125520_256956044.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/1447169429.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xovinugenetuv.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/jovesafikopawatunu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jimogifetovusoz.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77935a68a---nevofenurezoje.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/juwezefadokevi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EC 17076 bytes
SHA-256: 5282568ccdf2b6e4f0f4c8bd4580124c10632b71df9b74bb8c7219485fd6e500
font_01_sfnt_off000115ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AB 10552 bytes
SHA-256: 0cfc793797f35f499a21680002112b8bc348e3a50b1e5168efa35301362ed82b
font_02_sfnt_off00012dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000145e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E5 17512 bytes
SHA-256: 6d2658e03a56f9fde0867ca4d779dddbf99b2ca7bf447a8d6dbf92194fe2dd8b

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