Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84b7bbd8683f03e…

MALICIOUS

PDF

92.6 KB Created: 2021-09-05 09:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52a0822fcce9bf71a7424f8e057da0ab SHA-1: da3a2b40eddd77dec5885d091f47f47d7da65117 SHA-256: a84b7bbd8683f03e93b14003a51554ce1b1eda06ecc19694c528976a693c3af5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The embedded JavaScript and the nature of the links suggest an attempt to redirect users to malicious sites or download further payloads, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://irlanc.ru/uplcv?utm_term=ap+stats+experimental+design+worksheet+answers PDF link annotation
    • http://specimport.by/files/files/18053013182.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b7bd999ac4d0fec0c105cce0b798ad8/boloborep.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621650726.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/21447907120.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/taresesezajaxaxew.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/0a5c20abfe10899b132d8b71ed99e9d9/mowimerekubumewizagakim.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a2f3bdedc---begapoxobapifefuge.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/gemibisisowepozofivona.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160882b3764185---jabemikorubavataleb.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/pemuvanufutekawanibakubu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ffe7fc43---50699402782.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/48208292004.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/kirowurizuvivadukaxezudol.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/nunidaduwurizopos.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/buwenasokuribifirot.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/fimomenowujotise.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/xowufaxozunafaruvudiju.pdfIn PDF document text
    • http://tchid.net/userfiles/file/rekedopofuweza.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210816_073559.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/epjkfbkfd50nh7mkll69f05sqi/lixakefilulidanep.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/jopevageg.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bcac0075676---36745514646.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a94db802779---43887594677.pdfIn PDF document text
    • http://laduses.nl/image/file/ripovebege.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b4ae8d3cb---zilor.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/39250846208.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/61653898095.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_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 18756 bytes
SHA-256: af2d52de688993986d965d57b95d121f0bf857486f7241b9b801818fc5ff382b
font_01_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 11100 bytes
SHA-256: 48201e11c2ceb22e2c9c1112f5c08531d53ab9b7e187ddebcbe79e44e7cc75f6
font_02_sfnt_off00014cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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