Malicious PDF — malware analysis report

Static analysis result for SHA-256 477cef6c25f398fa…

MALICIOUS

PDF

73.0 KB Created: 2021-07-01 09:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 140b107eedc434cc7293a6726c4b648b SHA-1: ef3203b770b75f46a332f144a5b08e0e82e18950 SHA-256: 477cef6c25f398fab81484beb69822fb9897093288df3195a5839e9a7a1eb7e7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves directing users to these potentially malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://medvor.ru/uplcv?utm_term=if+i+like+you+quotes
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fec26bea9---lubejigasefa.pdf
    • http://steakclubhn.com/campannas/file/fetewo.pdf
    • http://utuin.net/files/fckeditor/file/54180845079.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ec99075a4---fafibuz.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749fd17a2e8---43862475739.pdf
    • http://sahrugs.com/userfiles/file/mozewa.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3d01d7629bca15b6fedff25f99c30e2d/7318855040.pdf
    • https://nikosdimos.gr/userfiles/file/53016061629.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/92bb22562633f1821bc36f056a8a6c37/65582304669.pdf
    • https://ystechpro.com/nbloom/fckuploads/file/52053943437.pdf
    • http://pwr-tech.ru/userfiles/file/gedotitomudebatelegono.pdf
    • https://mclarenquartz.in/ci/userfiles/files/53506066541.pdf
    • http://aaaexpressac.com/userfiles/file/metexowaliv.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160965515d7432---64030729432.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825610a0dc8---disajigelapojejazojal.pdf
    • https://bookatowncar.com/userfiles/file/16140729098.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/geditanutezexewabubutatap.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084212a12e7d---25078175011.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/fefukowenewixezilu.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d0ffb7cf1---16862832230.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160946961685b9---82045230722.pdf
    • https://chogmai.org/ckfinder/userfiles/files/37295390518.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_off0000bc80.bin
8e6ed46bbd909092562aae7a364c68f682f6a859edd6c82abb37aac1d15fa243
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 10244 bytes
font_01_sfnt_off0000d3ac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AC 16792 bytes
font_02_sfnt_off0000ebbe.bin
fbcfdae898bb6f0648bb872739b922caec3d5201a09f446694e56f9d6dc17d41
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 16952 bytes