Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b44b11a17bfe0d7…

MALICIOUS

PDF

92.8 KB Created: 2021-08-29 02:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4dff5f036486740730f30c581f36e571 SHA-1: 4d67841246db07d0c93b557b97803e8cdadba0e1 SHA-256: 4b44b11a17bfe0d7742dd7eee185d713fc3df84709e19f48176436ff0ef87078
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddecc100af---2038609794.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/73954f25bb5b4522cc6de8b07e8a7278/masolato.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210708054756.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/luvufevubogaxijapodir.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a661a01190a---xukogazawokar.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a6417df29---4800123791.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc32f5b65c---tujopuxulisidarize.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4051d3047c---76327908634.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/pujukitas.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/469a3c819c7011f3789b60f9da8916c2/dizinijalepipitevap.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/zevedirapob.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/gixeloteze.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/65047454925.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/95362616303.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/werewezeteloro.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16083979079399---nezaxujoxitinitagowuzisu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/40788311287.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/xumodanikejupisuje.pdfIn PDF document text
    • https://anfauglir.com/images/file/97505470153.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/wojamimobugu.pdfIn PDF document text
    • https://zop.bg/webroot/img/content/files/buzejaxuserinipoxanata.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/fusezinisan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+of+practical+electrotherapyPDF 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_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 18064 bytes
SHA-256: df9878cb0b1c03bb37d8f99ede039452a6a83455efd7a277c887ee51f8ffef01
font_01_sfnt_off00013521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13521 10616 bytes
SHA-256: 1f4612928e6f0cb8b3ff0dca18e441884de320313438b688c327c9995de54e92
font_02_sfnt_off00014d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1