Malicious PDF — malware analysis report

Static analysis result for SHA-256 985bc4e10f604471…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 02:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 885ebe9b6b695be5ade9751d7dbc88c9 SHA-1: 39ff60df24f11d7c06c1f8e3d3d5d2f6842fe96d SHA-256: 985bc4e10f60447110c4adb700ef1158cdd378fc9eeddeb4def58caea21a4de8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to phishing sites. The PDF structure and embedded content are consistent with a phishing lure, likely intended to trick users into visiting malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://ketchas.ru/uplcv?utm_term=pros+and+cons+of+using+social+media+as+a+source+of+information PDF link annotation
    • http://www.kickcommerce.com/userfiles/file/24981949902.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/4bfc70df6a47cef0336ecd5584507dea/47113249595.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/125b7e2hieie72meaf2ru2c7b2/zunekenoxixovoj.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff8440fd0---37787581854.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/jeratafige.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/pimuvagosoruwo.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f229dab0b---luvavilopowinokekivezu.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/delejija.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///74922494092.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210917_242BD5A91C5F281D.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/jekisilelanurujevo.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/jilevizarasezafawiw.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/44174823614.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/44290983982.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/wojotugun.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/pupijum.pdfIn PDF document text
    • http://355353.ru/userfiles/file/vusijamedigotepoputob.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614676f145061---tililasovotozudeb.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/mujelokuzuf.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/14404168822.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u5sgd3sq34oib63v6ke8ndp96n/32389914703.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/51584500472.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/gevobixenawil.pdfIn PDF document text
    • http://hasyo.net/files/file/78823338245.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/bafajezosa.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_off0000cc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49D 17272 bytes
SHA-256: 2f0e34e339a662377f9289fdc2ca8201961a6a05efc60c6d62eef0b61e7dcf3f
font_02_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 10920 bytes
SHA-256: 3632cf91001a09f3deed8ea3177fc752a8bbd4feae09d1ba5664b7c705c6963a

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