Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b411c3830f6b50e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 20:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0f669eeb75429438bffc85caf4ee686 SHA-1: 7607a5f9d3f613018c0504fd4388e83fb7ee516e SHA-256: 8b411c3830f6b50e745d2c2c43f03183a506248a0fe5b2405648cb922dd421e6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the heuristic firings strongly indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://huntic.ru/uplcv?utm_term=a+history+of+ancient+egypt+john+romer+pdf PDF link annotation
    • http://boatmonies.com/uploads/files/pikumak.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f4288f58ea6f60e5451edc2b605046c2/72565060903.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6200b7a45---zaguluz.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/11477026746.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/zijakisevejujinokedi.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/sajulanokajinajodizapiz.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9073aa45f9---patelole.pdfIn PDF document text
    • https://subded.org/userfiles/file/63205909167.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130315a54f38---legurafar.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/844937c345e62c0656d53ad234b25efc/gomipagivutonetu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/xetixa.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f5513169a8a4a61aa3b39682a59d1416/vovigosafuwo.pdfIn PDF document text
    • https://ckd-otto.com/contents//files/gaduxinatoloko.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9a70df9c9---72636119998.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/beniw.pdfIn PDF document text
    • https://penal-garazh.ru/files/5871516054.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/mafotojebapod.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nq3hfe7umj3bah4r4b66hmf9q7/66432273300.pdfIn PDF document text
    • https://fallsplat.se/file/37669518631.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/nafera.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8834a43c1d---94769851059.pdfIn PDF document text
    • https://zhansq.cn/upload/file/xovexibolasezivi.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_off0000bf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF25 16568 bytes
SHA-256: 5e5a02681b20d69c017c8e58a1344faa4de3ae6b8afd9287379c3c17ef54d236
font_01_sfnt_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 11248 bytes
SHA-256: 14ac4f28fc44bcaa6100e9f8482130ccafc9e159668a8efd80fcf2f397170f3e

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