Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b2ae50b5a3d843…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 19:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 200ab242176c68a4be952edd86c2b612 SHA-1: d746eeb9bfc3fbac68f47b426406669a1c05a51d SHA-256: 53b2ae50b5a3d8435ad62fa5fce900e8a02e2fb80cba1b387f291bd526fd65a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wastran.ru/uplcv?utm_term=different+characteristics+of+prokaryotic+and+eukaryotic+cells PDF link annotation
    • http://zatexpress.com/upload/userfiles/files/6010056511.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/21502178552.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/93377104622.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/53318560473.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/vebadetekepuminutu.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210901122050.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/18826350906.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0202e7f7---69096874537.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/8959593486.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370fc58c231---53786907729.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2da55bf62---63649150737.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/38810587311.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/fabetazukaxunafaba.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408906551cb---91591036679.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/pemunazululixi.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/23438312096.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/sodimi.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/viranero.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/4660760435.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/36568041826.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/vunajutepuzufago.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/vipelupazozo.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/pokijufirunasopinesigikur.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/dubuwoxadigazufuzuvoda.pdfIn PDF document text
    • 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_off0000ca69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27B 16160 bytes
SHA-256: 05683c395034bacf89ba20cdddd35f0753911a3cb1763b1d19669a3d3c4d6748
font_02_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 11024 bytes
SHA-256: 68f8738457ad91b484047129a732af4210555b992a8a56462a94988af958d140

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