Malicious PDF — malware analysis report

Static analysis result for SHA-256 a410976e4eda2c17…

MALICIOUS

PDF

83.3 KB Created: 2021-08-15 19:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb56ca91e092ba7c748e8a1916701dd7 SHA-1: 0f6a5c99a77e9a66f8d70b9e2547457387ec2e7c SHA-256: a410976e4eda2c1736f62856977bd46d17f742a4447c69ce7712e581cc9f5d89
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm designed to distribute malicious payloads. The presence of a 'Password-protected archive lure' heuristic indicates the document likely instructs the user to decrypt a subsequent stage, commonly used to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://huntic.ru/uplcv?utm_term=windows+7+loader+2.2+2+zip+download+free PDF link annotation
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0376f62533---46315102415.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cba32d74e3e---85898586426.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/13725077941.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cebcbe77---86101970154.pdfIn PDF document text
    • https://arredamentigiacobbe.it/file/13823404800.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17fe03c4af---93145599366.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c734723f665---23341862508.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112bd00a9da0---lebefusimurowuzapedenajiz.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/a780af7dd5cec88c88e460b211f3c951/busoniruguwuti.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/32070051458.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/n5ts14jadajsi3vmilifbn3336/fejenawipanepexijoj.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/xaladidozotidujurugine.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/3a4t4sbpvi34amsi5f6inqgm5a/3224038941.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/83516126330.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f86e3a740---linapunupoburopeka.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c592f92254683fc325a9482747cab189/tufijorud.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e567d3fa---69421209792.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pjb1an9618iopm4cv7gop31gg3/famakeb.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/nudag.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/52913822639.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/21317072409.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/n926d71aih7varm1rboktvhed1/nebolenigakenavugib.pdfIn PDF document text
    • http://naucseto.cz/storage/lavubotu.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/sazisububogazoruvorugidu.pdfIn PDF document text
    • http://royalproductsonline.com/userfiles/file/53514672627.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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 16244 bytes
SHA-256: 6a2d392036c3d4cf01b57d89808425d9726d246c8110b01fcbafbbe976ac7677
font_02_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 10768 bytes
SHA-256: a159b028a26715edef303115afee1ad8614857260832e4ec1253eaf36898cf07

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