Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f36a695c137968…

MALICIOUS

PDF

71.3 KB Created: 2021-09-04 20:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 397bdb18d439940b6f4c3b29585fcce9 SHA-1: 4a96db808f87d5c0af1b015892133cc111cd1cba SHA-256: 55f36a695c1379680825f76068042f71bd79e250d50280deb4f24dd3512f1c17
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains associated with link farms. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. This suggests the file is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crewmak.ru/uplcv?utm_term=public+finance+pdf+books PDF link annotation
    • https://nepalaviationmuseum.com/userfiles/files/49211503010.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/74117627069.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/poboj.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d6ed487c---kebovunabisagadiwurabi.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/kesavatum.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/36483574847.pdfIn PDF document text
    • https://coevent.ru/upload/files/24818611087.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ikk3333630akeeng4t9bppnf90/19351176243.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/17340423900.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608399478841d---raremovoxejagekeximov.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jamepogod.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/44baa73b1871774e31f527f6fffdaaf6/pagiraziliwuvawaloganade.pdfIn PDF document text
    • https://abeess.com/userfiles/file/99352086570.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/95588026293.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tefisumavalaxerofunexop.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-28/20210828021245897885.pdfIn PDF document text
    • https://kawanmto.info/contents//files/fupesufamuvexeratipe.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630782424.pdfIn PDF document text
    • https://tonitomov.com/picture/file/82448014920.pdfIn PDF document text
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/97860708019.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/86147344873.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/visiwixupiripoxogizev.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/61695292953.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/66354365220.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/24255308691.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf156b08877---2488937992.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_off0000b9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D7 10748 bytes
SHA-256: 2cddcb6476cb7eb9d87aa34e6e9326ce3e350cb3c4aa4ecb41fbeb5a1ce05715
font_01_sfnt_off0000d263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 14664 bytes
SHA-256: 0ff57822d8cdfb1f2cef52dbbfebdca534525adde9f4574bd20271486ab3a3ef
font_02_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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