Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed94f7f95df211eb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 01:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 366572eef070767020ee8db6cc670b60 SHA-1: 02d376e5473af19e17709f82c81928d37244d375 SHA-256: ed94f7f95df211ebf6d5392fbaa4fffd56dde2cc1554bdb47e03c1ba77e1958f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicates maliciousness. The presence of JavaScript suggests potential for further exploitation or redirection, while the link farm points to a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/23934a81eb7404f52e4e029fe80415fb/bogig.pdf
    • http://meghdoothsuzuki.com/uploads/30975720638.pdf
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/48473253776.pdf
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/zomomenomevi.pdf
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/nomaw.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/42276202400.pdf
    • http://tmkb.org.tr/ckfinder/userfiles/files/430339975.pdf
    • http://mskabel.cz/UserFiles/File/diduwuvaxuwaneruzidaxiram.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ec3b64b66556be41818a8646ed1a1c4c/20567655357.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421252e8ca6---53535400105.pdf
    • http://biomax.shop/filespath/files/20210902083204.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/54980438498.pdf
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/berojo.pdf
    • http://guidesdugrandlarge.fr/images/import/file/gevapoteg.pdf
    • http://idealthailand.com/file_media/file_image/file/puluka.pdf
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/durunafi.pdf
    • http://didongsinhvien.com/upload/files/vipamakonesisi.pdf
    • https://rougezenekar.hu/files/file/wodelapotawutoze.pdf
    • https://robert-zauer.cz/userfiles/file/96051138498.pdf
    • https://coevent.ru/upload/files/nureguram.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/2123634513.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+fire+update+apk+2021
    • 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_off0000cb41.bin
6c44fb7b9f7d937257e52595e3b5d04ab9dee829fa09d788cb065f42f6da741d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 10516 bytes
font_01_sfnt_off0000e364.bin
5cc5a8b151f3a53168f0124e5aca9684f5666fb40cecb4a9a01cc51984425058		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE364 16912 bytes
font_02_sfnt_off00010f45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F45 16792 bytes

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