Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c96a3a2b8ff3ca4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 21:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca9822e8d6932c23c90b871ebbff4fdc SHA-1: 2918c1f42c31e02583961eac45b72ecf2dd0e9ad SHA-256: 5c96a3a2b8ff3ca422695719ec8171bf253dccdb12838127d96635c784588737
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 embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as a distribution mechanism for phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/d59a800f31e56e72b8706d79e793d02c/52460050178.pdf In PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/kabikorokoveta.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/nekogonudekorenotepamome.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb82212c46---gipiralatepitulefapu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7c244798c9a1257edac6a50d03bb9bf1/piguzubiwub.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/76724714221.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e81e8cb2b7.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/93957538726.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vosipurowanoleme.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/75387227096.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/easq6gsevtpbvkvre3ndhmfsl3/taduriwazazuki.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/fudoxovoletutimapano.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/81450436412.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fca5807d2f2---nodabumafijodosituru.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/tuzerusepupopowexote.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/64274410464.pdfIn PDF document text
    • http://gzhs168.com//uploadfile/files/10823642722.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///48454087618.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/gegiworisimitajil.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/59607a9ee7c050b942ddc47f41d4eca0/55291710823.pdfIn PDF document text
    • http://honda-vo.com/upload/file/14744057721.pdfIn PDF document text
    • http://kco.su/userfiles/file/papinoretiburufetol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=past+tense+regular+verb+list+pdfPDF link annotation
    • 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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 17448 bytes
SHA-256: bc8571daafd89f9696061598dd1f32bb9dbf54a001303e122ba7eaa0ec5fe077
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 10860 bytes
SHA-256: f71d5273e89d81fbf2079415ea58c7b1b0efa44f49e4dfb48703825e75d5807e

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