Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af4b81e3cf51574…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 18:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 464e3ae3c634c09fb083bf5f6813d9d5 SHA-1: 872ce4c78998ef9ea630f8836710ca5e5e4d7da6 SHA-256: 5af4b81e3cf51574a9bcd8ab7db549f13c8834a9924704ea81f7300ca77cc9de
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to lure victims into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098ae73a5d66---jomajuxuf.pdf In PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/48225500695.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/92570101354.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/48958063177.pdfIn PDF document text
    • http://thelewisfamilyreunion.com/clients/c/ce/ce72a6ed4f7059d305e3bbfb121cee90/File/xogabobog.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/belelafa.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/xobalisevu.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/taguwejudu.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///sitefar.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0a045f8ce6a6f1a9cb7be3f8f593516d/tavesadijuk.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b920e4f2dbf---jaxemujadapabogoga.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/eq68tjelarbq3fka5709nerjeg/xekekixetugip.pdfIn PDF document text
    • https://raljob.com/userfiles/file/90788749793.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210707_163214.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/basoxejozebelonuse.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/43047595880.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1dd836ef0---11026809937.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/fowojixemodipog.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/wogesi.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/90377389222.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccb70a529d90e807f2e765e9217362ad/fumolukejuwaluwalowime.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/gifibogitisagex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=descargar+biblia+peshitta+en+pdf+espa%C3%B1olPDF 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_off0000e9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 20956 bytes
SHA-256: 67e5ced192868cddc4634e343968bb83935de5fc7a79598c3698f8c6c05f8019
font_02_sfnt_off000137cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 11248 bytes
SHA-256: e3464c42d6c23000c2674385fe9e73a93f22a1767c4c95b5faa542c9f8a52032

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