Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fdbbe405adcaa6e…

MALICIOUS

PDF

73.0 KB Created: 2021-10-02 21:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 58aa593ad8f7732f9502cfdd3343eff2 SHA-1: 53c9f9513cda94bf9b807b8e68040f74da7c5fd5 SHA-256: 4fdbbe405adcaa6ec874c32c0fa2d38abdd06459cb3dc56f093debfe4977cd87
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one pointing to a compromised WordPress upload directory. The presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classifier and ClamAV detection, strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_URI findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=stinky+farts+at+night PDF link annotation
    • http://jnejendomsdrift.dk/userfiles/file/xevupomifupodor.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/17769124529.pdfIn PDF document text
    • https://proia.bg/userfiles/file/giluwedimiwakupusipe.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/simujo.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/6283930257.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210920215729.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/57959679750.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e571c15b1---vozizolilufezas.pdfIn PDF document text
    • http://3m18.com/images/editor/files/11441715158.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/mijawatapakisamip.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/35461217650.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t2n6v629opfd6tgqsfp85dafq4/1991590476.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/peluz.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/pilaxafiwux.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/miminolapu.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/50092803616.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/wanagoxipa.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149293547728---sopogevab.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/47497533950.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/minosivufivofus.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5lgcv4e5phsfakd5b3558isepq/71992665469.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/netodapewuxosupibuwel.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/vumopiri.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/17194161242.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_off0000b502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB502 10476 bytes
SHA-256: 0b07e1c27331df16b11580e48abcd3a674f23451965f4d2dc7d2f83e69a5ff37
font_01_sfnt_off0000ccb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 19120 bytes
SHA-256: 1457c63ec110e60ae15ad0d21a07e989a2492e21104701c4bb820a1e4bb5bb7b
font_02_sfnt_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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