Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25119beddea5734…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 16:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8bea2192f4abca4f4f0eb7da82ab598 SHA-1: 42a9ff7697edebc14410b14fec607ced3fdbf5b6 SHA-256: c25119beddea5734c10a57c9796f3763c3db305306738c67d06f028e275850d4
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary function appears to be facilitating access to potentially harmful content through these varied links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wmasgroup.com/userfiles/file/vojebuwokatudajij.pdf In PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/51926198857.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a7ae4cfc3---86639409763.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/66031368847.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/fedaz.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/zinamiwoluduparefikaw.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/74764493657.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/21752610480.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613995fb104f0---gujosapopup.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/revoxexukixodubugupidafod.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/selevotetegasufoxam.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/gofokarojowuzubezapuvanep.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5244799905ac8b1d00b4c901d2312045/52539875617.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/49792969743.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/mixaxaroka.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/dabofumesorop.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109120604074020.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/84968567399.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/goxezamafepikobuxolokop.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/98171690832.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/10830951829.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140eebe8c6ba---35802556523.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/vukagefigo.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/fajureruvoxawukolezuvog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=jora+2+full+moviePDF 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_off0000c961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC961 18888 bytes
SHA-256: 4b549c6f170d59bbba8237484d9160b5374c923b773761ad3ed1f8fc85f104cb
font_01_sfnt_off0000fa75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA75 10284 bytes
SHA-256: c098f550a6c9f9537de66c87af902b79041a70a2d0e9525c43d2c824b919cb6f
font_02_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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