Malicious PDF — malware analysis report

Static analysis result for SHA-256 652c3c7f3e8d9cf8…

MALICIOUS

PDF

113.8 KB Created: 2021-07-03 01:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44c757dd3341f3fe818c9229846412f7 SHA-1: 252d4b4553036a9f9c3e8e15ce3ec3b7e51a8799 SHA-256: 652c3c7f3e8d9cf83e9535bf037c554ac7acb7ea64552061bbcbeddbee2ee7d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098542d24336---82540378932.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a0a7e8e8---sijujotabufidus.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/bozewefavezusoxisilov.pdf
    • http://acutecardio.ru/sadm_files/78954625588.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e62c0726---zotovarikafulurumusizu.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/f93pvlg61to5j8o74na8ceiieg/losufiguluwavotutuk.pdf
    • https://csn-alliance.com/data/files/66853338568.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/5h7ph1njlltpth8hh52vl0u02r/rijinefobopudinad.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/p7ll901jtgdpuc3chvle8omjab/43060847470.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/26620974756.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/wiramav.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/12e5bfcee256bac7d1e21e91d0a8d417/rizurovavoduvapenepopa.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/46993873985.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/009a3e99be22b42ea914696da4184d40/wufitewirawobudug.pdf
    • https://beautyyaurient.com/editor_upload/file/xopib.pdf
    • https://mimpishio2bet.com/contents//files/75046590343.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/duvhgdn31tpkr2vsvohfi7nni8/fusukitusufumiru.pdf
    • http://shopsuathientu.com/uploads/userfiles/file/86532546714.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e167346785ef4097ed93638ccee2530e/nuxawij.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/kusutupizifitixem.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ba568081f---babediresumuminul.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072077b5eb96---842019366.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/11757a8d606a6c38e99f32bdfd7bcee3/62806284352.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160da95b72ddb9---xobuvijulodajaboxaxu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=road+traffic+act+driving+licence
    • 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_off00015ba5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15BA5 16792 bytes
font_01_sfnt_off000173bc.bin
84256efda28838e3a42048c37d265971cffa3d4a0e79cbf3efdab9129d43f059
pdf-font-stream PDF embedded font (sfnt) at offset 0x173BC 10596 bytes
font_02_sfnt_off00018bde.bin
27de786883f1b810ba186f2ec1908c0541ee0a13c6b59cd3f500d75cd4e1453d
pdf-font-stream PDF embedded font (sfnt) at offset 0x18BDE 16892 bytes