Malicious PDF — malware analysis report

Static analysis result for SHA-256 429f1cfbdba0f012…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 15:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5c3300cf7c937cc5a438f5c676d606b1 SHA-1: b09320673d21698a17e00080e78f4e7b475267a0 SHA-256: 429f1cfbdba0f012ea774d2b2982b13567c36c0e48f2ca5ab8b211b4f3371548
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://allytemp.ru/uplcv?utm_term=android+offline+maps PDF link annotation
    • https://renteci.com/imagens/file/vufemi.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/begiripumoda.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/piveloteremalovagegamop.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/60351470143.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xetagenizuroru.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/gurumafepofuxufolokaju.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/fuzobi.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/92569263664.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/pedusifodadegon.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/kasopovoxetilidefo.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/37028796002.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/50918258810.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/52258472012.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/74094614849.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/70014350570.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136a41a7fb68---jokimevufita.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/10956099725.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/7096549697.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/13889489419.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2u87t59d66mlsvqlcgu6hi0nag/15729682876.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/23769728332.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/kurovazupowarafowedomo.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e28e74b3d---66266823428.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/jewaxusaxujukefulibumafop.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/xejatozerizegemolagexopun.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/diziserifilukoluv.pdfIn PDF document text
    • 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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 10540 bytes
SHA-256: 5c699d75261315f4b7738ea469db268f83d28923c390277adabcfc0e1db2cf6e
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 16436 bytes
SHA-256: 608184bee78ceefa1fe79a088ec87a09822a6535860b3489380bf59daeead23b
font_02_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1