Malicious PDF — malware analysis report

Static analysis result for SHA-256 6885b871d31d1953…

MALICIOUS

PDF

111.0 KB Created: 2021-09-02 05:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e4b3ede9c56ac12264b3e2b8fd3a013c SHA-1: dc7a4c3b064671262f58248f7ff1c6366b0c2079 SHA-256: 6885b871d31d1953bf638a8568dc0e8a9966d8aad4d67897710b7aa31e7c15a7
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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 http://daglichtfilters.nl/ckfinder/userfiles/files/vigonafom.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/2egjmrj4h9cbngml2rtqvlfd0i/39129692552.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8ca7616e551048450dc9d3c41af18d64/tasozozazipepas.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/28298303392.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dd690a8154f1b8f4c449bbb8fca5e42a/74361524223.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707fcb809a---58424912723.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b1de65cacdf---8328155448.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc05ad8a03---sixadipus.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4a63c758f---zerotuzika.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/o31t6pr411j5c0amgre6vaolpm/79071768791.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/92216090325.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/temobanifedenip.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffae16a951---rapililukumubusadases.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/luwipatenaroxomovo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e81788478---81321208081.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/c7edcd7e7e3ef6f017b2825483eea7b3/bipomiro.pdfIn PDF document text
    • https://x-software.cz/data/file/lanifafazej.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/40793131252.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/26654116628.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/bikotevaxevomeg.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/lodobejivelamenizokemez.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/tavefabefifanebokovujegaw.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160fa673e06ef9---xutowifufisojoforidan.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/89010034029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=drop+table+if+exists+in+sql+serverPDF 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_off00014cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001650d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1650D 18516 bytes
SHA-256: 9e40a89d8637ada1152d792ffe920ada5e96b7215b3b275587df4329b80ec1f6
font_02_sfnt_off000194e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194E8 10808 bytes
SHA-256: 657055f8cfd9a4fcdf888b219a43f0326eb6efd5c4f2bb5030583dffa6cb827d

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