Malicious PDF — malware analysis report

Static analysis result for SHA-256 42da7c8f13473603…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 20:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5cef18f62beb9ba01ef06e067812233 SHA-1: 8e61d592376af5c3836e7eb8439588d764b42fa7 SHA-256: 42da7c8f13473603e012c3be80c35bc34198deff82912d6bbcecaffecf346473
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dnt-mayak.ru/content/File/41708766447.pdf In PDF document text
    • http://abaj.cz/UserFiles/File/78618917372.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/39177642047.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/lutorimat.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614128452e08a---90620387258.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/26682037967.pdfIn PDF document text
    • https://2winit.com/Files/files/seresuzalegabepesiz.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dfe255e2b88550772558330e72cbf22/7341060614.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/dowufowitagavamojaxid.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/kutugazipavot.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/nejubisatesan.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/geset.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/jefagexiti.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/sasijapadakoxu.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/41332752207.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/90804129671.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161399adfe7980---67871277112.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/giboguwutosos.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210917_D2E82C5F0C318F93.pdfIn PDF document text
    • https://ibextrail.com/editor-images/sejarigorofunolaj.pdfIn PDF document text
    • http://hingliltd.com/userfiles/87372164320.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/bebimuresoxeg.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/22031687076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ps2+games+emulator+androidPDF 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_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 17848 bytes
SHA-256: 86024922e7a552cc96bbac6f767fb40aa6a9eab05829c97952bcb7d805139fb2
font_01_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 10812 bytes
SHA-256: a9149f513766f7ea462f4b469d7b7c1c0a747160c447adff1552109d0b8be46c
font_02_sfnt_off00011be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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