Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ab711ef76e7c91…

MALICIOUS

PDF

89.3 KB Created: 2021-08-26 08:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6005ed25d7cf8989747bc6a835ebd9bb SHA-1: a8a9e8b5ea29b390ecf6a89c6a746bfa3bab340a SHA-256: d9ab711ef76e7c913745c1f7ba444ea43f1ea80210c3538a892051098f33892c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a network of potentially compromised sites.

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/301ff71b417ba07ec08eaa8f2999dd7c/rewuzemopamazine.pdf In PDF document text
    • https://baobihungphu.com/media/ftp/file/xakatexureruj.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/digudezere.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ebd05d21---zesaduke.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba1e2e97ff98097a3f4d7ff6a42119ed/89139692465.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/53066ee5103415cbcbbf64b433450ef9/85162969719.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/d6eci3n0dbvdjvea55mt285pfb/31712852317.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/begarakezebiperoxemej.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/sojut.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/eacdb5fa5884c7545ab09b2fa61fb149/pelejaji.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gsf63askdd1n8i2ne0tjtr4im6/xegazuvapegamigun.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/wiwobimeveza.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/68768004878.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/41333672270.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/19015026324.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/42pi7e00h7sp2ogvljsusahdnf/14123293234.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/56132881634.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/tixomowaxatufogupoko.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90dc46faa---85835199880.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/75995419451.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/352156246.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1901921659---95551192921.pdfIn PDF document text
    • https://lesura.net/userfiles/file/94073240699.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6b2a95ad224b7edbe46f282357981bcb/lezavewogavige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=baby+back+ribs+and+spare+ribsPDF 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_off0000f96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96D 17204 bytes
SHA-256: 5b86ecb6985ce1c8a2e35e5fab1087e5ecf6737fc14e661f2074099690869c23
font_01_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E82 10640 bytes
SHA-256: a8df66b250f0bfffbf7de91b3e5a9ed61b555cd4467ed616acb41d2d6160d318

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