Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3896dc6610ba43…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 03:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf22eaa834d9346861607eb42d4281bc SHA-1: 9d41c2026d81a04dd69999ea923784049f510f34 SHA-256: 0b3896dc6610ba43e44eff548fbf210e8ba6e84e289820d0a677cf9883e9e37d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs that form a link farm, likely directing users to phishing or malware distribution sites. The PDF structure and embedded links suggest it is used as a lure, potentially for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=construction+material+management+pdf+books
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/15922555288.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bf86b754e1c---ruvavatajina.pdf
    • http://agriturismolionsfarm.it/userfiles/files/jarovanoramigi.pdf
    • http://mmsmarin.com/imgimage/file/musasikejijifesu.pdf
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/6139f3b1bca935aef040801c0cb5db2c/wepiv.pdf
    • http://tokyosushilohaus.com/uploads/files/kawodakifutugavupepu.pdf
    • https://advance-pack.com/editor_upload/file/xonirasodivepoworireleja.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611860f6d6f3e---mezuvi.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f92b2b1295c---99804359757.pdf
    • http://ambcavallon.eu/userfiles/files/81045956905.pdf
    • https://coluer.ir/documents/file/genabinulowo.pdf
    • https://aymfly.com/aym_image/files/30041754017.pdf
    • https://pezenasenchantee.fr/userfiles/file/miwajaposerotugatowoli.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160969e96ee9aa---gisajoguvibomirogumufene.pdf
    • https://lienlacanien.com/img_pages/file/51365758966.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dg1ur2dumrthm4vejibfqdktu3/sozunebemop.pdf
    • http://denge.aero/upload/files/tonobobefimilasuzagagij.pdf
    • https://cambodiadriverservice.com/userfiles/file/zikuxixisuzejekirup.pdf
    • http://yuha.be/_files/file/kesexugizudupafires.pdf
    • https://africanresearchcenter.com/userfiles/file/laxefarupumeruzodiva.pdf
    • http://aktifimmo.lu/userfiles/files/fokakexexibe.pdf
    • https://latework.cz/soubory/32505091865.pdf
    • http://delfosventures.net/userfiles/files/49046517217.pdf
    • http://soles2walk.cz/data/file/fidisumot.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66c73fbc8---16486628374.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f029.bin
540f900e51a062e3164011cf4927605c698d783abca7ccc637366c20e690ec5c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 11324 bytes
font_01_sfnt_off00010a65.bin
8ef26092f65dbbfb4a9ec43bc53e3eeca4720526cf632a567c7bfb6a42ad4bb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A65 18132 bytes
font_02_sfnt_off0001394d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1394D 16792 bytes