Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2ba79f631ff596…

MALICIOUS

PDF

83.0 KB Created: 2021-08-20 14:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b2508add3ec2efa1cb7522534853663 SHA-1: fbe8d8b110eca797d660df3de675739172c0c170 SHA-256: 3b2ba79f631ff59650a7ca4c82fda8c758f3f54602fbadee0d605195acf0603a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to host or distribute malicious content. The presence of multiple distinct hosts and the use of formcraft plugin uploads indicate a coordinated effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9b2ed565---xerigimuwilolegisafanugu.pdf In PDF document text
    • http://dienlanhlongan.com/upload/files/fizigugixosabuduxepuxe.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea2b5d774---tewudosunube.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/89788412589.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/midorojamujefawulokibo.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/5236409012.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/rorijobu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096455b4acff---xuvebinozubop.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096d6165fc2f---91658670063.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/gutafo.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d34ef399b79---24785804993.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/64033696164.pdfIn PDF document text
    • https://anup.bo/images/files/53098321368.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a712c6efa---jitux.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8a5e9123b---89118217028.pdfIn PDF document text
    • http://qzgj.cn/upload/file/6647936768.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/ximomivalakamawuz.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/giroru.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/73183071034.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/37009435518.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/65474025505.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/58471401814.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0643bca9e5---maladebozavejamevajofagu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df724db9ea2---9255934436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mashallah+grill+bath+avePDF 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_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 17456 bytes
SHA-256: 8e4e0f7202cf1d675dc61bf71264ed6e8bf448050f5aabc0568604a831c28c21
font_01_sfnt_off00010d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B0 10364 bytes
SHA-256: 93d76efdd6dd7fc80f58f92b29d707a66bd3677211f02ca498125662fcb06cca