Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93798d3c3770df8…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 02:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 546daf6d8a11f7a3a293c3e1bd8ff2b2 SHA-1: e48643f44f95630f380095a4009bcca4acffaaf9 SHA-256: a93798d3c3770df888d7d9d0175fea70144cb40b7e86bd5572876abdce375804
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to distribute malicious content or phish for credentials. The embedded JavaScript, while not directly analyzed for specific actions, is a common vector for exploiting PDF vulnerabilities or initiating further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=index+of+criminal+minds PDF link annotation
    • https://badrivishal.com/media/feduxij.pdfIn PDF document text
    • http://usmleworkout.com/files/file/tasofakekemanexuzuditiza.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347cb65ef49---95542341037.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/rovusojanavitux.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/netebesowuviludebote.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/pakovoweka.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/78105989775.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/bopigovarejepisijikasabik.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/2589620761.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/xigedabodutajufizuguzawij.pdfIn PDF document text
    • http://jump360.co/upload/files/20210907190142.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/7558864390.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/70420656139.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/xepumuvujebogeguwikesob.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hnbrb69d5ffn772b80c4aniku1/zalawuxutozifesage.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135469174be0---vepabobusow.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/58686956134.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_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 10592 bytes
SHA-256: 48c39e8d6c67c3c06f6c4ffd1609f469e6a3bd205ae1aa9085b784eadc121dfa
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 18960 bytes
SHA-256: e33546dbd680d31ad1958707097a006a9048c0a325dbda825ad1610684719d8b