Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca998402d58cdd6d…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 02:47:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d134f9429377362de8e1a5a6c794547 SHA-1: 009ae0914e64acfd44162d285c068b85146af8f1 SHA-256: ca998402d58cdd6d0e30964160222916d7deb540c3e1e36b4a1e409fc56f39b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains. The presence of external URI heuristics and link farm indicators strongly suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://smidgel.ru/uplcv?utm_term=most+important+english+sentences+pdf PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/fudakubamubegumewopobaken.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5245cba82---nejegexabonexuz.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/52146811659.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb129d8ed0---32221409713.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bomaxojakopitobugutizupe.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/rewime.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/88880640640.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/larider.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/79739967267.pdfIn PDF document text
    • http://htwy.com/upload/file/rabonisowemebidoketutari.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4838a295cd61f395f3d90994acafb349/xikabepulus.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/wovivusozalilox.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/namelokevipofivamefemuno.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ilcjnsah37utfdsr95qhe45217/desivalujutizuba.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/vunomedamelem.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/22980190598.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/xubononafozuxikezezuviba.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/ginamububopog.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/tewafovetojuwemax.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/kunupe.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/lufeb.pdfIn PDF document text
    • http://hotechike.com/files/files/fezokikur.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099650825674---sosuvejonev.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fa5c2ebde98ad190cf5ae62d27301f78/29803616449.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/29853453646.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/vowesux.pdfIn PDF document text
    • 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_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 18536 bytes
SHA-256: adbf0cfc567d6720dcaeeba073da7e27a416ea2eaf02176527abed991e93d6a2
font_02_sfnt_off00012f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F3F 11060 bytes
SHA-256: d9bec9bae7201b1e9cd958def4ebc62ea82b5447ad63c73946e9ee113fb387fb

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