Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cbd1c1507154c38…

MALICIOUS

PDF

69.4 KB Created: 2021-10-14 01:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2e96ec4d227dc43e70773d6409393388 SHA-1: fbe836b0aa36e37238329eb6f3d29c152f0e2845 SHA-256: 1cbd1c1507154c3887b11420f6673007440b4e804ff8c7fa9ff1900fafc618c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Embedded JavaScript was also detected, which could be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=i+was+you+were+he+was+we+were PDF link annotation
    • http://kythuatviet.vn/uploads/userfiles/file/simuxevoxuwe.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/30568832420.pdfIn PDF document text
    • http://wodepcb.cn/uploadfiles/files/peloxobiwurum.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/44509967106.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/82870726649.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/69124613770.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/punobomoxa.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/46c3450442daf2732774acc0703f037b/52348176512.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109151054392993.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/todanizaderagezinon.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/rilagaraj.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6bfec1ca3---97482251607.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/28007583118.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/mezusezufogetesiga.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/93419133515.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b722d049fe---ruwefaputotol.pdfIn PDF document text
    • http://letdentalab.com/img/files/rotunilerejululu.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/xapurufudumikikun.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/rokalotitebuvutaxi.pdfIn PDF document text
    • http://cwesp.biz/upload/file/3540560240.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/98343461962.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/72868985874.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/ced93872a231bb3d08eab12104c8711c/fepiloxazo.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210924/files/20210924130315.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/17628981390.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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 10116 bytes
SHA-256: 677182878c867b954a89b7b4e045f0fe86cde12496cc86ab80f480022e7110c2
font_01_sfnt_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 14536 bytes
SHA-256: 77dd28f077901f23238fc96b431cd2fe9475ae7bbf8fa02a663629461c0e34dd
font_02_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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