Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a378e1b4eec6efb…

MALICIOUS

PDF

92.5 KB Created: 2021-09-02 13:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea10a93f5103ab4f5c230e8d86cf6e6f SHA-1: 98c3c09b6342e42bd08b658210886679188340e1 SHA-256: 4a378e1b4eec6efbfa38d2977e6e2f4820d92f3d0093609e6a9cc624e794eac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads, and by a ML classifier and ClamAV as malicious. The numerous embedded URLs point to various domains, many of which are likely compromised, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1911e6e5728b478a9ffc058cbce53724/71029810203.pdf In PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9nj838lf5bu5lohcrmpiukpmf6/2049456545.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/xukevaroxatiwulideteget.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0eeca4cb49866b9ae273e0627d2e4666/91054720435.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/modosaririsisibilowu.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/57950135965.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/72006961416.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fb81fc27---45778889944.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebe895bade---kerokavepilogifi.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/46999835577.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/fuxapokuvitunexi.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/gefosakuz.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/29847541277.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/68331825818.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becd3fe0edc---33689251688.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9f6a05179---xupazazusajotes.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094795bed26a---lalasiliraduzofokimipe.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/83760789013.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/xoxejizuxibiviwipojoloruv.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/92367347549.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1611e3d5a6afb9---sepebijegadirusewa.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/wujubab.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/49879982863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=abstracting+databases+for+systematic+manual+searchesPDF 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_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 11256 bytes
SHA-256: f8bf5cd09fc2e46799a6c89b6ed54dd1c6237e54b4d8582968fe3fb1cc728fc0
font_01_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 20232 bytes
SHA-256: 7fda9da5db9881213c23d0cf7f6e8c173235a2431600913698ff3be80e5662e8

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