Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5fd21c40ddd9727…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 04:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b82483c7a15357b147e2ae37fc153f49 SHA-1: 376818a95c543a57d2835eb12eab93a988a17dfd SHA-256: e5fd21c40ddd97275f91999ed462f4636cdcca8808065d64fd0a0a6424146ae6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://joyear.com/ckfinder/userfiles/files/vemini.pdf In PDF document text
    • http://cementfeet.com/userfiles/file/vowamadojonadeb.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/68803806796.pdfIn PDF document text
    • http://kd-council.com/upfile/files/62093620291.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/17713651880.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/jasoxunururemiwujobip.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/nefajo.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/22143534321.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/9f2465a807b0ef342cfbb6adde48c0bd/nukorakutekowamozitiv.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/ce2d3ffbf74b1f5770cd690a08943411/bavesusajarafatapa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f107bdc5---renatevexutebevezi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/22834207944.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9235cca3d0---radatatudilovu.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/56061920325.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/nixenikemipowuza.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/4522833136.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af7a8b3ab1d---72365830905.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/8818115047.pdfIn PDF document text
    • http://btfa.tw/upload/files/jugarezazanaderutel.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/sufinokipiwoludofewilite.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b776cbf05db---70934845471.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/jozegazebopipubemo.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/bufogurimavozefozabikavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=despacito+piano+sheet+pdf+freePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 10672 bytes
SHA-256: 39c9c6052cc608ece7436be8de1dc724aa776a15d87ef08f94292d4554f01925
font_01_sfnt_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11807 19240 bytes
SHA-256: cba618bfdd63a12f9108b8b96dccc2673d7eda5f52b5f921c49f6e70fb986919

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