Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa06739935743b43…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 05:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c18b2ad4c673f1192d5f525216423aa3 SHA-1: f98b2f0e266240d8e5d2de457eee437db6af4291 SHA-256: fa06739935743b439576fef1168cccc0038b80f66dd75f16ebc74ba94d56e298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://dukra.sk/editor_uploads/files/derawivopadaliz.pdf In PDF document text
    • http://chromatographvials.com/d/files/taxusejijomitu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105112220.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/10229200482.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/jipijarusaruzubewenovud.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ddgsftea8sndjtkm6unkukkhsj/domuzawob.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/vozenexurojasoxazegu.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/lokerutazufatawubep.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/jizanovilamol.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/65794772902.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/kizugiwaxunejigomurefe.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0tjje35fgecurvhfo3c00lcmsh/72501540424.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/93830948074.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1bf15c30c94bcd28f6e70f4270df3784/kamakuri.pdfIn PDF document text
    • http://rc-modeller.se/images/file///73351026608.pdfIn PDF document text
    • http://donghotam.com/luutru/files/fixozinulam.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/79673795519.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69591685ba---wuzogisetalibogi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gdlqp096b6j3flffk4s6qg7317/ladetaramezatuwi.pdfIn PDF document text
    • https://langumeistras.lt/i/File/93677064635.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/47742932026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=antibiotics+simplified+pdf+downloadPDF 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_off0000d6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 18016 bytes
SHA-256: ca5cf0e5b6c9b9e71cc71d156e742167be91ce38a04a15cc2ee37dd8f9939c1c
font_02_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 10888 bytes
SHA-256: f427c072e58cd56d84fe90b23c425e74f05e5689a1beab26f833b66adf8b9812

Open this report in the interactive analyzer, or submit your own file for analysis.