Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9f39e38120f2bf…

MALICIOUS

PDF

82.0 KB Created: 2021-09-14 13:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95402e8e5b4659a1021318c8f860b464 SHA-1: f36206b2b780391d8ab40c7f6e820e4255f77e9b SHA-256: ce9f39e38120f2bf7df2a85dc09a2fe5d585b8fc34f7537a03fc6b35ac947a72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

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 http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/texare.pdf
    • http://naturallabs.de/userfiles/file/wuwemolukipufo.pdf
    • https://mytopics.it/uploads/file/sefesavifen.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6de3a1208---fegujodafabekorizelox.pdf
    • http://tnmetalworks.com/images/files/fimeruriz.pdf
    • https://gelblighting.com/userfiles/files/giregajupagegezelosad.pdf
    • http://airconbank.com/upload/fckeditor/file/wuloni.pdf
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/feduvabalefowifudeb.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161366677d7032---25815984863.pdf
    • https://ecoolteh.eu/galeria/file/28431197430.pdf
    • http://studioarclab.eu/userfiles/files/39993819788.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2c6db93---nefuzosemetonob.pdf
    • https://santa.sg/images/users/00000000/files/70739002977.pdf
    • http://collectifff.be/imgdb/accueil/files/66212193667.pdf
    • http://ooexperience.be/assets/Image/files/bedutafive.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613870ec8a1c4---52971693338.pdf
    • http://chinhsuasolieu.com/media/files/92747973502.pdf
    • https://nabil-doukali.com/userfiles/file/fipuruxexalepof.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/pedugekugusop.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161307317a7dfe---11605207574.pdf
    • http://parmalab.it/userfiles/files/lajetid.pdf
    • http://markasib.ru/ckfinder/userfiles/files/kanaxolinegixejigumav.pdf
    • http://savvyais.com/userfiles/file/piput.pdf
    • http://apmnir.ro/fckfiles/file/bipubinexevufejonu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=house+flipper+cheat+money+android
    • 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_off0000da30.bin
c2b6caf225a2b3009526a6e4cda57014661742479fdeb49559518050b152bf8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA30 11092 bytes
font_01_sfnt_off0000f3da.bin
80aca11c3146dbcc5fb4495181320c61a77088b8b5a6864c7b81971f5599bb42
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 17796 bytes
font_02_sfnt_off000121ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121AB 16792 bytes