Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c0fac6a56cdc83…

MALICIOUS

PDF

81.4 KB Created: 2021-10-05 21:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d32db5dfc1ee49776dcadf603044a1a2 SHA-1: f75fbf278e5d6d1a88f3597fca18b73b593609a1 SHA-256: 92c0fac6a56cdc83941921db6ee8622ebdbaf39f78b866498ae085374a9deec5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=copy+numbers+from+pdf+to+excel PDF link annotation
    • http://bobmeetin.com/media/galleries/files/81840539746.pdfIn PDF document text
    • http://hasyo.net/files/file/33496300793.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613638550b737---pawuxomamulivawajuxan.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/lalijimubewe.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1cbc286f5---9842256982.pdfIn PDF document text
    • https://askflip.com/uploads/files/pagunax.pdfIn PDF document text
    • https://csn-alliance.com/data/files/kajatukozutinog.pdfIn PDF document text
    • http://secoinblock.com/upload/files/fagowomelakege.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/98330622855.pdfIn PDF document text
    • http://doxity.ro/ckfinder/userfiles/files/53590511130.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/59924352960.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/90970341895.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/52834212704.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210910_2D8F90E84A2B7098.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/sovevul.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/70053389260.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/79588233403.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/61128427721.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/67654130126.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/70931334247.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16153efda2b5d6---64167973547.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/vexefimigijipixupur.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b6f439a6c6---24700901769.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210910_80DB74BABB87855E.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/89547372195.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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 11012 bytes
SHA-256: 2b67990fd7383a64b63bf161995a7b7612ad0473dd9488fe2971cdaefb2ce4ce
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001083a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083A 18604 bytes
SHA-256: 4dfbabd285b4b3e8a929fd44fc13b4d496ccc2cd35cd0cb821a36e4ec2a36c57

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