Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c310112e2c3938e…

MALICIOUS

PDF

90.0 KB Created: 2021-09-14 00:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 013921330544c60406f20ae001ffaa3b SHA-1: e04a21ea3099b030f603afc79940d239b7a68f1d SHA-256: 3c310112e2c3938e602939b7e91698312bbb3234545282bea93776ec102944fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://clingac.es/d/files/38770009939.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136968f2748c---40212802330.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/36184870073.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/gidilatajunasene.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/99759932452.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/25686646342.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161301f1208d8b---44806934102.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/33324466219.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/59387065612.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/putuwew.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/2ee84bf06c95cb2be94f52ca130a1775/86763952059.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sugevopuvonafij.pdfIn PDF document text
    • http://dsagco.com/Upload/file/wiwun.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/37462770169.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/towigorekoxizebezosip.pdfIn PDF document text
    • http://ccshecea.org/upload/files/gisodirojavovax.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/jutata.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/xufanemigibazabepujo.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/gopopusesirejavamu.pdfIn PDF document text
    • http://jcpingie.be/public/files/28164641427.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/kodireraguzorel.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/nukisawoketa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=counting+sheep+roblox+idPDF 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_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 10884 bytes
SHA-256: 331acd83e4be14f905dd177493c6791f5f212cc15764369fdbb399762390d4e0
font_01_sfnt_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 20196 bytes
SHA-256: 523099e2454e1dc924d871fd40b755b0a38e2f84b7494e956ccdd415231b313c
font_02_sfnt_off00014300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1