Malicious PDF — malware analysis report

Static analysis result for SHA-256 a485cad3a7aa5297…

MALICIOUS

PDF

82.9 KB Created: 2021-08-11 03:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e866da4e2abba1a1171eec3486fc15f SHA-1: 214c35cc207bf17b424cbadddbbbd13e7e61af8c SHA-256: a485cad3a7aa5297003f6d12ce6dcaa79ed15fc050a552a9deb69d77f08e239a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress upload directories or similar structures, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e146b415---vumagukapimuveba.pdf In PDF document text
    • https://benqmusicworkshop.com/fupload/file/fegudulu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/newuwebiperojo.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/fixemibirasapo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7f6f55bc6---nupagosogegipazaw.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/naratotodasezoviwati.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d453e0af358e71dde85f133bba985f01/meviserulop.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/54567391793.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/diraxoje.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6oc738qrd7bkpaj80iu7cmoo5q/40311203719.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d363914054---49556206775.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/35368316129.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/5712686833.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/96824499377.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/41066317741.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/surenuxebekituzeposazise.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/52123763377.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/wopedixigejub.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9789718e4---wojawipira.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7dec532fe11ce0b167e090b2164d877e/91400413205.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089407520ec6---guvatewawevo.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/80943618500.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/45411622692.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c1e104c0f---sepapeferil.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/84352288783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+drainage+water+management+systemPDF 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_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 16444 bytes
SHA-256: 6f29b914a2c9a3668769076a2d2cf1d5cad67ce11fe6c3f2b8a859416c97beb9
font_01_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 10724 bytes
SHA-256: b08c2416a4817d584f53b36cd3cc88bace7a605546f97e9b8562ea8a7c213746
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1