Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42009b89486224d…

MALICIOUS

PDF

87.7 KB Created: 2021-08-13 09:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9a6f933b09ebad8dd42119d5236d809 SHA-1: ddba0bb955719c87d1394d77dbd596c9b4cf27bd SHA-256: c42009b89486224d881741aefd61473916fd996d2cea1ccdcab70dfa85d5e4e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 https://crewmak.ru/uplcv?utm_term=imagery+and+symbolism+in+jane+eyre PDF link annotation
    • http://asahiru-ban.com/files/files/87719987812.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e5768a882---13772786550.pdfIn PDF document text
    • http://sakem.org/userfiles/files/kodefakudozoj.pdfIn PDF document text
    • http://ping-property.com/user_img/files/puzov.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/32831310845.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210626004754_c72at1.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a9ad42fe---66362973670.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e6d01fe9f8bbbc75cf7f70c7a3d5240/turuwumowutilufabafekopen.pdfIn PDF document text
    • http://aqcons.vn/upload/files/wevujitefabur.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/gefefitejulowosu.pdfIn PDF document text
    • https://5uempat.com/contents//files/71763483991.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f9f77cedd---mujul.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/kazofewavomosa.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce627d4bd52---ridanugenefako.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/lokazow.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/kazitilok.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/nuvutivumitirim.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///34270325477.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4396ea8239---9957779832.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/36327634594.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/79461e2f5914b6fa5a54d61daf063f27/12060736750.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_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 10828 bytes
SHA-256: 966c40f5537a350aa1a9bff5bd35b17c9db11180b3568bfffb03209fab5c36c1
font_01_sfnt_off00010d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 16772 bytes
SHA-256: efe57c4f0bd6c49e21f81382ff3f85ec8af51a71915a6f29f98c4c154046ba94
font_02_sfnt_off000137fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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