Malicious PDF — malware analysis report

Static analysis result for SHA-256 346fec55a8d052e4…

MALICIOUS

PDF

85.3 KB Created: 2021-09-12 02:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 122a85865221fc96018b5566a2925d7d SHA-1: 1e013293aea8baff90237b93ee54ef3482640f2e SHA-256: 346fec55a8d052e4d5f469fa5f5b3803a199ae286a3d48ba2475d552f303c40b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to external sites for 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://infrive.ru/uplcv?utm_term=plan+de+comunicacion+organizacional+pdf PDF link annotation
    • http://montex.pro/uploads/userfiles/file/zetodomuwazula.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133573deabb8---pevojamezexone.pdfIn PDF document text
    • http://cissi.it/userfiles/files/81392495977.pdfIn PDF document text
    • http://grabnerestriche.at/33097358044.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109100944162477.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/34952241271.pdfIn PDF document text
    • http://datcat.vn/2018/file/84993317300.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/patirirarotibe.pdfIn PDF document text
    • https://digireg.nu/upload/dosozipibe.pdfIn PDF document text
    • http://honghuibio.com/d/files/34101083107.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ddc6e0184---vibiranujoliwefazuxuw.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/1923553646.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/mevanuxegulonupowe.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/pubiluzuzizoduxaviwij.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/17091456019.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/runanodimagosoxaja.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/57374942927.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/lexesegiporibivok.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/wexipuxipefuxera.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/22040045650.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/zuwewofo.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/32571880355.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d25ec6e6a1---99303680436.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc65f3ee50---78633419736.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/juwop.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_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 19028 bytes
SHA-256: f5840740ff286eddd5093a0046c1c23ee3e8b96d475c75e9cd525a36cd274f5a
font_01_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 10860 bytes
SHA-256: 42bba2d98aca7525299fc0f44131fcf0e9870d04f126428feaaf70392b1bf9e9
font_02_sfnt_off00012eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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