Malicious PDF — malware analysis report

Static analysis result for SHA-256 5657f18b0d5c9182…

MALICIOUS

PDF

92.8 KB Created: 2021-07-28 14:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f77afa2c37f285e3fcc7a890f90886a0 SHA-1: 20439d8374a05c7412a557231ede39d25a15c47e SHA-256: 5657f18b0d5c9182c69fabc48b9c782638f4f70511aa9a9e7f68539ddd76e2f3
156 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8cf661e9---93825756375.pdf In PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/48571351755.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/89455166964.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/60154009854.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce468cda056---gudabelewaroz.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/fujaxam.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9f4754e5082e0c06c5309d8145f89b6b/84694992288.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608808e96f979---80386124435.pdfIn PDF document text
    • https://cecprint.com/images/file/12886982595.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/mabezozo.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/jokuxamonimudevivowur.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8998f2899f9557401fc251ac012481c3/29295424594.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d68305e4fce76eefa59b7ce5ab595133/kodonibepepagafibalarag.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/60877281209.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6860afcf1---98720811604.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/99820527581.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079cdd34b877---34139035941.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac69960188---fijimus.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/seud46sjc0933rfanv06k91i3o/78966030547.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b5ec2ab9765f614ec5e87c66df59716e/30272905743.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/78388075107.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3a01817b5---15321486580.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/82883940228.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/minegavivofazaviki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+continuity+in+accountingPDF 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_off0001076c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7E 17220 bytes
SHA-256: b50ab97c9aa28803c1be54d246a3fb4c780de5525798554a8fdf999f8eca9634
font_02_sfnt_off00014c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8D 10440 bytes
SHA-256: 20a6a0ec67931e3a01fd255342b23972e627ad76ac19d03071e32abfbb300730