Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cbeb7205516ac46…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 07:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bc20493ef93f838796cc18eca79ebf66 SHA-1: eb9ece12004a7d58493a78252bd138c39a318d91 SHA-256: 0cbeb7205516ac461d153638521e94f5bb77cab697ad52911ac3354a0a36b12d
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://miwon.com.vn/app/webroot/uploads/files/jamidoborefewibo.pdf In PDF document text
    • https://pharmnet.cz/ckfiles/files/files/pejojewivotilu.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/46952744028.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/fasanolaridofenetekofo.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/borunudatefomudoj.pdfIn PDF document text
    • http://xfswchem.com/upload/files/80766092648.pdfIn PDF document text
    • http://aa-nusd.jp/wajesapenimotejuxed.pdfIn PDF document text
    • https://abss.pt/userfiles/file/25674597065.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/711d52c0aa07a0fff8b75e4dc689d98f/85605982405.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/74741287413.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368700414b1---wezavudasa.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/14952df335686f34bbdff9ed54873328/robanilosokujo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/27617798346.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/67614866579.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/fejivufo.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nufevalexajikorazi.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/melixaxamupadexaweken.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/35846972083.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/58001702945.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/foxurakipizogav.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/merelepego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+action+full+movies+2021PDF link annotation
    • 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_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 18916 bytes
SHA-256: 251d22742b3f33b1d0819db887af0239fb4f515e7f92002a9cc7f9cbca0f4908
font_01_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 11124 bytes
SHA-256: 6730cffa08e8793c93dc7b7b51379ee43bc6bab2046d3b10d6cfb89e881b89a1
font_02_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1