Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b923bc3039661ea…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 00:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebc787b7634eee5055109c3ba9a48eeb SHA-1: fa4e26f127718599dababaee67b165babb69af88 SHA-256: 2b923bc3039661eaa6653ab72bfb20631a3c9cae1a32a7448e7c85a9ed169a9c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites, suggesting it's used to redirect users to phishing or malware-hosting sites. The PDF structure and the presence of multiple external URIs support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=new+interest+rates+on+post+office+schemes+pdf PDF link annotation
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c6dee3d7aaf5df685d79751016d2983b/71431473656.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16120ebe27d178---11861727057.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba164b16096---zasukekizona.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/rumekowov.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6b1328vnhuugutjacvdtjirpq5/nodegilewelobegepuli.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5aa1c6902---14269174277.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/zonigu.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836d04d0288---gulafadojaritivavaxazafuw.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1de86ad79---zogulujarugam.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/19295905483.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/53704744665.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1588019951.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/41025981086.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119d995b93cb---tetasase.pdfIn PDF document text
    • https://businesslife.com/content/file/43653161835.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/98092677183.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/tofatobu.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/55693389263.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/49a9ab70a68448e4bc80f00b642bec65/dolikupuzabezoxelekonape.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/ponoduxe.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/38101626765.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/k60a4gg38njmstm9al3u9env9q/32167785891.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f90104c9c---giwapelogebuboxa.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/8346222552.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_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 10904 bytes
SHA-256: 2d2b49db80e5a6e7e3671911f2a88cf9f7bc7c9f290604a3e92296d18582e2a3
font_02_sfnt_off0001024c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024C 18080 bytes
SHA-256: 296535989b9035efadc0fd2cc14666b28c59d900c1d89313b4ecba3679678f94

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