Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2678254ee642efd…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 10:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 546937d17c09751cf4f7b71aed5b17ce SHA-1: 27efeeda54affa52e18fd38026e9e39298739931 SHA-256: c2678254ee642efd20a9e8ccec01cf6d97734d0dfe5496121ec3e6278d3a4a2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, directing users to multiple external URLs hosted on various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=the+sopranos+watch+online+123 PDF link annotation
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/23143867155.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/negowulatifevuretunoxi.pdfIn PDF document text
    • http://ailizia.com/userfiles/70326656297.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/69349302787.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/56943340211.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/56993919523.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/18291962766.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135fca7b6cc2---doruzujironotovikuzavufil.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/futuzinafusadokatuki.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/75d1f562b35acd94eb8be9cfc0965bf6/nuvigufosoxoxezotage.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109051443554689.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/72153180152.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/50822272087.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130d7446cf58---sixilixenabawunew.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/18440991718.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/kenonaxivapilawevororimi.pdfIn PDF document text
    • http://bptramptour.pl/files/file/27289807768.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/16951325470.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/41382921133.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/21695588812.pdfIn PDF document text
    • http://baove24h.org/upload/files/98805756859.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/fiwuzorekor.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_off0000c036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 10864 bytes
SHA-256: 4dbb5f372f55af982ae1102aa5629ee59c5a43d7d5443f83458c5ae24cd79548
font_01_sfnt_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 17864 bytes
SHA-256: acdf9d9196d704319580bd76df0cd39565f69b0f6efce495080683e5b4d68761