Malicious PDF — malware analysis report

Static analysis result for SHA-256 9813bba057ea6f87…

MALICIOUS

PDF

78.3 KB Created: 2021-09-04 02:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 557e19329c01420b57e2d60cdfe03423 SHA-1: b034677922206cc611f003514815d9bc952f3c01 SHA-256: 9813bba057ea6f87363cd70ecee874fcf42da0516eb9b2a112d71c09f6532a87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nepalimodelagency.com/userfiles/file/33765285063.pdf In PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4418a265068f880b198ef6a0eb20338b/vajepab.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/sitofewamesu.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/fizuwejosorosinozokogatu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccd18d6a7f---31088005344.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///26378378801.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lilix.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/zexomu.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/57349342064.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/5ihu1fdes06pcvduqr56vm9c2v/84270895366.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/nutajudumoweronidosusino.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/kejoleseke.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d7cf4ea9fd2---19816947861.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/3468315983.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/lolopulagerizukifupozoj.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/waxuvomofaren.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/816b385d880c1dda74dd3fb805ac8118/puzibis.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/43350678523.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210828_653B95007F7F05D2.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/17106470771.pdfIn PDF document text
    • http://farashimirooz.com/files/luvagizujedonigiw.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/vibememitera.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/sanefifex.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9e5b27e4ab5fa7cbbf8279da1df4ad88/24472555721.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a56d692aab4---talobivefapilerimubovabev.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/94278188422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+sing+hallelujah+to+the+lord+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_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 18396 bytes
SHA-256: d2ed41b2c7c2196c4ac1fde4282388616dcedb7b201827e70b9f09e184d3e5ae
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11202 11096 bytes
SHA-256: 03bbf5dbf8cfe31168d1e072ae93b2a44b9f1ee9876bdb882334f5ab36a34972

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