Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5ae1f803588696…

MALICIOUS

PDF

119.6 KB Created: 2021-08-12 02:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fdbb398583555a4e2ac3b39e462becfe SHA-1: 25efc5297cfba664c475d8b207262a86b813e38f SHA-256: ab5ae1f803588696b781a078077df03de2d1e9ccd5ca7349ec3b41432cdd256a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised CMS upload directories and disposable hosting. These links likely serve as a link farm to lure victims into downloading further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as a phishing trojan. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening or interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/nq7bojsl2b8vrg4fci3ggdmp0r/siligenemasatadonovobemi.pdf In PDF document text
    • http://musclecar-taps.com/js/upload/files/devonexemejezetutekeg.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093449142d84---kukosisunota.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e40e5912d---depino.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popujebuzejixuvakenefekob.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1aigtj29psi2mpobjles2cfro4/povubomofategi.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tudt466tf4f203itjlasbpa7hv/28572511583.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/26947650220.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/jurukaxosixiserumibadoxe.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/11809382628.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/56937473595.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607840414ff24---tewid.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/it0p8ek1j2m21hbtkiqclt30i3/15704170546.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c882d9df111---kikep.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/bezakesetone.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/livoki.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/rekinibisipirapas.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/pupexir.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/ec83d9ee68c2b72303c7901265ff4056/werob.pdfIn PDF document text
    • https://2acontractor.it/images/file/33218480770.pdfIn PDF document text
    • http://sunfitclub.ru/app/webroot/js/ckfinder/userfiles/files/sobagufugubikalif.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/66ed8642c38ab55dbefaab2c14ced845/59848650913.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fbf5b6c7ca8ad7819043a5157ebea1d9/diboronuroxovadosulufuzu.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/bcklbdrcd6hfmr0ssi2uqlsecc/17091030164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=motu+patlu+ka+cartoon+bhejo+video+songPDF link annotation
    • 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_off000170db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DB 17532 bytes
SHA-256: e04c28dfc389b0d10d5fd3a4e1eb7b0164ac8015baf3aaffbb3d88cc24f299a3
font_01_sfnt_off00019e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E87 11316 bytes
SHA-256: a14bd21a4804af9c552072326641d070c711e27a2696c16f49d9a9f505f3b0e9
font_02_sfnt_off0001b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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