Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a6def2f645e6d1e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 17:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 92b75f20531399b53a678f41842e5885 SHA-1: 06d410e02dd7fa93db3bd4b4a9f20a891078f9ae SHA-256: 7a6def2f645e6d1e96e75e14f4a399d1b38468a70c7a9dc9957b5eb6c79a9ba2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs that form a link farm, likely intended to redirect users to malicious sites. The presence of JavaScript suggests an attempt to execute code within the PDF viewer, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=star+spangled+banner+flute+sheet+music+pdf PDF link annotation
    • http://ahkjt.com/upfile/file/57596026739.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/70ea608d52049d7cebede9beb626cd66/mixofewu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18959ba79---degemurusisugakugateribas.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/3bb3c71c6d54203e4ae1845f01b506d0/muranujotodarewefidesi.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/fuxorekavisiwox.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021070708363983.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3b3c66df---jexovifomev.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8eadll21jmvq0sc524eqdvamu5/guduw.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/9652760258.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4084fc5998d0b2013f9ef3fc56126bf2/13532205219.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9857ab6a---24446524629.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/10805849918.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/dofdfrlqpqicogom1oi6524pi5/98186109414.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2f98153c---23492571304.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/tifeme.pdfIn PDF document text
    • https://bczenekar.hu/files/file/dofelumex.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/34255851091.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/031392f35abd3e2eaa12b1daca375448/71125779105.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/01fk5ac0fe1c7djhglcoenrie0/61433163353.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202108232026444466.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210817154908426280.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/fekodizejokejijovuwokupok.pdfIn PDF document text
    • https://digiconelectronics.com/media/93988828171.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/58100818001.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_off0000dfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAA 11264 bytes
SHA-256: c1b03b1cbfe85e14aad40c97d8aa092a2aa652793ed17fc3c05175087499fa74
font_01_sfnt_off0000f96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001117d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 18848 bytes
SHA-256: 5c25d7ce4e3fdefe7260283d2221f626561e5a929ddbb61562a2357be3732258

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