Malicious PDF — malware analysis report

Static analysis result for SHA-256 57ba9a809ec2c3b5…

MALICIOUS

PDF

90.4 KB Created: 2021-09-07 10:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1978de531ad56e7a8882def3c02f7004 SHA-1: a615f34506079ceb307da220fc7aa3c7263fa45e SHA-256: 57ba9a809ec2c3b56a9d12395af066e85323030a6866d9523c4704d1b69e344c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the 'urgency lure' heuristic point towards a social engineering attack.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=schiffman+wisenblit+consumer+behavior+pdf PDF link annotation
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gfbsfvd9vrc6iltiovlr1bcj52/78488646331.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/34da7e250d9703fc80e38ed5d505a6e7/gopofewixijiruzujalijelon.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f41a0c33577---zalajanabifegomobapiru.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/83594500397.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/99ada8741332ed197515d0c316d24e52/92573458534.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/20514315967.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/94553068713.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/masotitibatim.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/12209743443.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ob1rj41t36fugrfunoesv9jl2q/80463864726.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/c708dbcd62408d3bb49c7182a5fb7c5a/gapozowojibazeb.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/07d5920713d151b763138781a8c80074/22741150963.pdfIn PDF document text
    • http://imaginove.eu/data/Files/rajusisezidev.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607af914ddb27---linor.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/finoxizezadakilamejareb.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/f9s2t7vhob2mh5v829gpifiv40/10492686607.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/15135744552.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c5041d6616e8166267ff693bcec782f8/kawoxutefurinidibeso.pdfIn PDF document text
    • http://aweibel.com/Photo/file/32105673255.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/divixivifijag.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/jagubefaviwivubojukoxa.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/37238025744.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/62935356588.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/jefisogib.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/52118417359.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_off0000f89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89D 18584 bytes
SHA-256: 05ebacc850b4cda0651af50a22ea8dd5fb8fa96885832834083397fb275056ca
font_01_sfnt_off00012913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001412a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1412A 11352 bytes
SHA-256: 6474ff8d281bb1b7b912deabaa9decd266d4a2e21887835f0c324bd1ea9190b0

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