Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47c0c4fd7f48434…

MALICIOUS

PDF

93.6 KB Created: 2021-08-14 04:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: fe87a2e8f31e928a771b203ba92fb5e8 SHA-1: 05f85f79c37ce456fee12004a29fadc1b2d70302 SHA-256: b47c0c4fd7f4843493dadba7ca8c446bd47af84c4e5b85d7f83702007cbb3a87
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, making the document a tool for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=rebecca+daphne+du+maurier+book+depository PDF link annotation
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8352a4ecf4d5fe052297eaec7174acbb/jixelixusikobatibuzi.pdfIn PDF document text
    • https://ptogel2.com/contents//files/lamekakazepujanerojufen.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/39243654619.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707bdff32c6---40984560975.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/pevupijimija.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4b9cee008---kokabuk.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de7964cf7ba---65572095352.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/tumujanu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/9pujedon922nu3llkqn4eajrc6/wekivixofalavexafonog.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/mabaf.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aaf6t5s36lr28aboa97q5e4bb2/tigot.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c1260ace8c616bc464f666d809770bc8/bikat.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/paputawasolowakefon.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b9951ddfd---63516894803.pdfIn PDF document text
    • http://biomisszio.hu/tmp/litedeku.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dcab2589---52348710030.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/tilegejokegozona.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/14373216398.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/vebinelo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c53ebd52822---23934975990.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/72380805590.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/jozupedusenamasow.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b96d0f824e0---75741573696.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 17808 bytes
SHA-256: 717f82a4e9bdc0a2087346e8165e60893fd13e2da28d1a8ae780c1e8b63d8eeb
font_01_sfnt_off00011e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E72 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000133b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B8 11224 bytes
SHA-256: 63706028301dc2185d10197166595dd71d8d18eedfcbfd0667a8461d0b730b2e
font_03_sfnt_off00014da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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