Malicious PDF — malware analysis report

Static analysis result for SHA-256 455bf1faf9f72b9a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 23:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c015e3e27a9229224baaa8e18c226af8 SHA-1: 8aed8e91a02c4919bba54aace9ccfb38e919848f SHA-256: 455bf1faf9f72b9a4d63e6dccc97803a0dd4e2e557966ef85d6a8acbc8225e4d
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 as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the nature of the links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=surface+coating+technology+handbook+pdf PDF link annotation
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c71525c6933---fusakorenejexunoxolo.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16117358de9694---ledakosakisezegekoros.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093d266d70c1---dojekegimixepurejanuj.pdfIn PDF document text
    • http://k1a.ru/images/files/file/sijozabumodapovenujon.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbfc2cb4b---97967779083.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/kovone.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/44390926800.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/69999517906.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/77185836074.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/79190425625.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/63665155599.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/18917105397.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e6740f004---mapifenitebidololukur.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/6693043421.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/90423175458.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/18408374390.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a32e565b77---kepuvabos.pdfIn PDF document text
    • https://lasanisports.com/files/tibumifizazefigosekano.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a538eba5db---33612028574.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210703_567F99D69D5425B8.pdfIn PDF document text
    • http://kechengchem.com/upload/files/58112780886.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_off0000cf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF21 17988 bytes
SHA-256: 1b254e888ab278a679c72bf1639827dd0a495bbefe5e1de55c42fc8d6487f769
font_01_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 11252 bytes
SHA-256: ef84e40962dc037de7ea72ec2f8f189f6fc3fa240f0d5ba44f045b7b39c03ccd

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