Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbaa8a6d41ca8a71…

MALICIOUS

PDF

90.0 KB Created: 2021-09-22 14:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e83799c3bce2c8a9210066085d79ea60 SHA-1: 1d9854bce7746a0e49649cfa63ce1aa10001593c SHA-256: cbaa8a6d41ca8a711817269e732e9dd8993dd6ff166fc0df27bb41ce66bbd23c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely to obscure the ultimate destination and evade detection. The primary goal appears to be redirecting users to malicious content through SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/u2603kqbg144m86038brvok50u/14493351670.pdf In PDF document text
    • http://theflowermaker.com/uploads/File/futejafemolozemafukisinub.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/68370564614.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/32866801052.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614807cf68c91---59627962049.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/210904130905705332u0k419sla0be.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/356981845.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/neripilat.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/mikimowerukosek.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/mezomawipi.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/pujapulapabupigofep.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362c86532d3---32973008971.pdfIn PDF document text
    • http://seamacros.com/upload/file/46697192898.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/bekamape.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/44917267123.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/54360152302.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b57d1a9984---vedamekone.pdfIn PDF document text
    • http://analhospital.net/file/files/19562698500.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/nokokuvudisenulutefa.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/58294564317.pdfIn PDF document text
    • https://schmitz.cz/res/file/jaxadazelapofejiso.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/84690148715.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/dinolodarepepokezaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=watch+50+shades+of+grey+online+free+without+downloadingPDF 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_off0000f7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FC 11304 bytes
SHA-256: 13d9eba3e2174d3eda766d7388788155bc491e3261363fab8365e7574a4403b5
font_01_sfnt_off00011276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11276 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 18376 bytes
SHA-256: f0a219587aec9837d5de176e5ac0c41cf6a3a324ffbd4ee45194226420513ba1

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