Malicious PDF — malware analysis report

Static analysis result for SHA-256 712e48b02a39ab30…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 18:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45871d0fb6810932c48a19574e38f6ff SHA-1: 89580ed2c47f66ddcb784d0b6075a4066debcb90 SHA-256: 712e48b02a39ab307d3c1ac75b1816547126e11b5691f5b1fb78054f7cb5fc50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user engagement or potentially for SEO manipulation to lure unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://crewmak.ru/uplcv?utm_term=exotic+breeds+of+cattle+pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160fe7ab66d7db---17079079684.pdf
    • http://almar-bus.pl/userfiles/file/tamedifewevulowif.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4f8ce7bdc---fupulatufatina.pdf
    • http://twfbs.com/ckfinder/userfiles/files/81400983210.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/32500182685.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098f704d8bcd---72640503636.pdf
    • http://www.sport-konyv.hu/userfiles/file/vupegupetolojojat.pdf
    • http://tilestone-pools.com/i/File/27184434288.pdf
    • http://www.blueoak.fr/image/file/95487420277.pdf
    • https://hssanesteban.cl/files/berukot.pdf
    • https://tosto.cl/ckfinder/userfiles/files/zuvukejawojetegiwimotak.pdf
    • https://ncsccalgary.com/userfiles/files/semak.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5201e4a85c---tasoxifitesoxukek.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90c697d5d---taxajebegidubeminak.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/9grcn6634f16cm2mgttkmp3ed4/30642204118.pdf
    • http://muszempilla.com/files/file/70701554760.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4dd2f231---wokiguburasibizukuxo.pdf
    • http://gangwonbnb.com/FileData/ckfinder/files/20210830_55B9DB18FC2E52E0.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9a783435---fekezevamewobixegise.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/50184851630.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/gugugipapemakumagex.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/11174514404.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2ac7606182c68a739dcf8b018a399c69/12883487776.pdf
    • http://erbamedica.org/userfiles/files/xenijiluvuridixopo.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/83d59afcbceedcaec6e06678aee5f31f/52022767925.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ea.bin
8f907c7976da8140cc7a5c9f5d0b3ace558af49b376d901e805a48e533cb6ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 10732 bytes
font_01_sfnt_off0000fa7b.bin
ee5cafd52bc8319eb578031481c8bc1aa48b947fa8ad8f6c40cf341f9fa700a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7B 18312 bytes
font_02_sfnt_off000116ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116CA 16792 bytes
font_03_sfnt_off00012edc.bin
622a275b3e9a29286592667b0aed50cceb3a56561d27d10068a89bebd1bcedcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDC 18004 bytes