Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec957eac0c141378…

MALICIOUS

PDF

80.3 KB Created: 2021-09-30 18:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36a439effe1572fbad3ea0eed76ef3aa SHA-1: 9f6c8cf74df3d6b3b5e32021e045334a0e6d8328 SHA-256: ec957eac0c141378f973639e449a047a403d727132407c7ba509d00cee56efa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs embedded within the document point to compromised WordPress sites and other domains, suggesting an attempt to lure users to external resources. Although no scripts were explicitly extracted, the nature of the embedded links and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316007e66ae---jisuginebubureranisawado.pdf In PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/xezepesetidat.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/bunufumorerusiwokub.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/70031130396.pdfIn PDF document text
    • https://j26clean.com/upload/files/sorutanenete.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/vuper.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/9828014847.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/44390719833.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/86940399551.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/toxulazibira.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/xaguzo.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/98799509259.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/kojopuwodibovika.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139ddd0c91b0---bezazuriwewebofarulu.pdfIn PDF document text
    • http://atrsara.ir/resource/files/zogodozakepeke.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9d19b4c6---kufaxipamojizijofo.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f168a86528---45459272220.pdfIn PDF document text
    • https://grouptm2.com/contents/files/risarebet.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210905205349.pdfIn PDF document text
    • http://kag.fr/userfiles/file/zeposatuderux.pdfIn PDF document text
    • http://sunway.me/uploads/file/162016013285.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2153894057.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/lepesif.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/zofix.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fae88b43f1c77a0dd702d0364d49d4d3/36212663224.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/23504233428.pdfIn PDF document text
    • https://eurotig.ro/file/24298940493.pdfIn PDF document text
    • https://raljob.com/userfiles/file/84182304955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=best+android+app+to+remove+objects+from+photosPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 11228 bytes
SHA-256: ab7f76b57051708bd2da5e45367fa9ea8e67dfc0a8088b8fe353c360a024f673
font_01_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 19300 bytes
SHA-256: bee214e34ce6f5388f3d262589da9480428997d77f277314844498a8829d1ee9
font_02_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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