Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7883470fcf7ed1…

MALICIOUS

PDF

67.7 KB Created: 2021-09-23 07:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9771926a932c67bc3f67a7cffa2cb086 SHA-1: e758c0b2e69286252e6e7b41ea346f36e77bb143 SHA-256: ff7883470fcf7ed178482cbdc49828cd366b36f36b069e6652230d750e141c10
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan variant. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF link farm indicators and the ML/ClamAV detections strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bipalisdemo.dashindonesia.com/userfiles/files/jorivo.pdf In PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/69209896667.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/7661161743.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137778625d25---mozonifejabuxaxozov.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145ad4b8b638---49404875612.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/topozevilobarulusefewib.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/67226174600.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/bovepavagojosax.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae77492403---33029115417.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/11490293256.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/95790461700.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161367e2bd4856---melowemojidizewivikotupen.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/gusesufopuxavamupademi.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/jejeluxexu.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/18656863084.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/41942231192.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/4423691927.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vizejubidubok.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/pivemipore.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///3609798418.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=best+way+to+download+mp3+on+androidPDF 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_off0000abb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB2 10980 bytes
SHA-256: 922b4051ad2241b2dfc32e7d3f8d4792838f2ac5a864d5234d746ec30de82085
font_01_sfnt_off0000c540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC540 14420 bytes
SHA-256: e2d6cda92ddfa27675503165290864e29fa7c5230a5374b5ba4b04a39eeb0120
font_02_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1