Malicious PDF — malware analysis report

Static analysis result for SHA-256 affb322934effca1…

MALICIOUS

PDF

69.0 KB Created: 2021-09-22 17:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8280c0c1c6c16ad6d00087e1fafd5ca7 SHA-1: 572f1af1364856e7bd78fe5e19f87476e4ccb6ae SHA-256: affb322934effca1952681ed1dcc4eeb1f02e3fa2af0757058777cfee37c2102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of link farms or compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing or trojan PDF. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=today+tamil+tv+movies+list
    • https://lifecareproduct.in/ckfinder/userfiles/files/66519261910.pdf
    • http://thementalhealthadvocates.org/files/userfiles/file/93157033883.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/79990451782.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/xadugisomaze.pdf
    • http://jjkxmy.com/upload/files/202109012221146304.pdf
    • http://romanasulcikova.cz/userfiles/xedenosuwapasu.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/waxumetamefunafiwasozi.pdf
    • https://unique-u.biz/images/uploads/file/50102502161.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/muxujosi.pdf
    • https://xanbiente.de/userfiles/file/tosugevogevoxezifaxew.pdf
    • https://melz-feu.ru/upload/58318568466.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357b2487786---57648369924.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/pufosobizinekufage.pdf
    • http://resortvillairene.it/userfiles/files/mepagoda.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c807175c---sovuwogosojitez.pdf
    • http://canadanur.com/resimler/files/lexixana.pdf
    • http://baobianhkhang.com/upload/files/35906816640.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/3957206279.pdf
    • http://bbbo.handyfriendship.com/upload/files/levenave.pdf
    • http://mamolenasnc.it/userfiles/files/19323965889.pdf
    • http://puntolinea.org/userfiles/files/gezepulefosivuvek.pdf
    • http://jgbt.us/pds/userfiles/files/66002323305.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2deeed553---63095395356.pdf
    • https://peptidturkiye.com/ckfinder/userfiles/files/jufiwajeluruv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b269.bin
b75e5aaac1c831e7c8af4daf66b0a9e58582aac8e232398f9228feb5d0d5988c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB269 10348 bytes
font_01_sfnt_off0000c9d3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 16792 bytes
font_02_sfnt_off0000e1e5.bin
9ae3d6bc23777a2c37466004bb72e6504a055d3366b14e3137de97ebfd620da6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E5 14940 bytes