Malicious PDF — malware analysis report

Static analysis result for SHA-256 337d1ac90c4e193e…

MALICIOUS

PDF

83.4 KB Created: 2021-09-23 17:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0f668ae63d1bdb9dd4528aed11b83d8 SHA-1: e7f52818406483b0c65a11a8ddec2c4c6642a16f SHA-256: 337d1ac90c4e193ed06bd8d18d6eb84961606813454f645102b22b153ff50ebf
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to disposable domains and compromised CMS upload storage, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://chcial.ru/uplcv?utm_term=is+54+prime+or+composite
    • https://nestsearch.in/admin/uploads/file/dupimotakegofileti.pdf
    • https://jotekonybakterium.hu/userfiles/files/sonosaxitikitirosudi.pdf
    • https://pointvirgule.ca/upload/editor/file/wufusominisixebi.pdf
    • https://pasarant0g3l-turbo-h1t.com/contents/files/vasugakekiti.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b9e40a066---rinonupizonep.pdf
    • http://artdental.hu/editor_up/24783990162.pdf
    • http://pixel-pro.ru/upload/file/batovisajomuwutovusam.pdf
    • http://coumert.com/images/file/49333128612.pdf
    • http://mycoapaisyl.com/webimages/files/56520187009.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6c08a39379cde407b7d6fb18349cda5a/27177926125.pdf
    • http://aquatherm-graz.at/files/pulugonulipenevupakutoten.pdf
    • https://kermoulin.com/userfiles/file/99907186363.pdf
    • http://hanilkwanla.com/uploads/files/94357611269.pdf
    • http://chongthamnguoc.vn/img/files/84440663070.pdf
    • http://oralrem.kz/ckfinder/userfiles/files/negovamivogojukejelejap.pdf
    • http://jr-bang.com/uploadfiles/20210912213815.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/494843db009dca9c386291ea61985851/fuxavupires.pdf
    • https://nvsrolko.org/ckfinder/userfiles/files/rumarik.pdf
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/vuloxa.pdf
    • https://egyptsuntours.com/userfiles/files/wawomowitedogi.pdf
    • http://hieuchuan.com/upload/files/85481560077.pdf
    • https://mtmnetwork.net/uploadEditor/files/ruvumivazoxi.pdf
    • http://jeanthompson.nl/ckfinder/userfiles/files/duvikop.pdf
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawebonupizukuvapol.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_off0000dbd3.bin
76a799f70fca9c31a38b0712275fe8e05dbd7e8b89b70f6c7c65d388d6afee93		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 10388 bytes
font_01_sfnt_off0000f372.bin
ee72c2c3a894823b9870a5a8e784b851fd952f7d3da9023e09e59b69c25ff4f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF372 20292 bytes
font_02_sfnt_off00012834.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12834 16792 bytes

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