Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e86d5ef97f019e…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 08:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8f771bad64db5ec73687a36e2944f6f SHA-1: c04fa8b98c123f036e8d36071aef7c7d0f63bb65 SHA-256: c7e86d5ef97f019e1e31dff6eb232499072ed5a56d900a8f94f5bb08aa82b4c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple links on disposable hosting and compromised CMS uploads further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=how+to+close+display+over+other+apps
    • https://alakharia.com/public_html/userfiles/file/3683288105.pdf
    • http://splogservice.ru/content/file/31572292471.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/58373004004.pdf
    • http://linhkienhunganh.vn/luutru/files/kirutukivomuk.pdf
    • https://turdv.ru/SITE/files/editor/file/pozotifudakidu.pdf
    • http://hfengly.dk/skoleportalen/userfiles/file/meliwelimu.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabcbe6cc0---zukimabog.pdf
    • https://limsurdua.com/contents/files/71583959444.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/93442327970.pdf
    • https://mediaget.ru/userfiles/files/fudapapopelegujaredufit.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/7097445569.pdf
    • https://idea-web.ro/app/webroot/files/userfiles/files/77193361194.pdf
    • http://mtkshop.com/images/uploads/file/xujeperume.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/zufojopewakadorazofet.pdf
    • http://17njl.com/userfiles/files/30474648722.pdf
    • http://szymonadamczyk.pl/uploads/fck/file/66149923931.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9gav627m91b4sd02mvg57ripdg/27697933871.pdf
    • https://bamfieldrental.com/userfiles/file/wikatu.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16142cfd4849ed---kobuzofamefofinasuta.pdf
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/43272752362.pdf
    • https://icrs-as.com/userfiles/file/93987446025.pdf
    • http://gro-felix.si/uploads/kawijerezodenigudiviw.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/dijurojosaxepajadizatumo.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_off0000da08.bin
4f492dcc32fc0594f6400d958d84f917ebe7335cf1022e0b6429a3fc10c06024		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 10764 bytes
font_01_sfnt_off0000f2fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16792 bytes
font_02_sfnt_off00010b10.bin
0fe796f5445e39162a6bdc7b32929a478a1ca357c1d73eea97bc8dc311869927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B10 18664 bytes

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