Malicious PDF — malware analysis report

Static analysis result for SHA-256 13afd27bbd0b4f2c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 05:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f805a939fcd6f0eb193bef77036f2ce5 SHA-1: 92ea8323f6142cfa4da9f7c71d16ba718002f28e SHA-256: 13afd27bbd0b4f2c98a6d855574590d5ccc4fa7efa9fc991eac71b708e3b6535
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=comprehension+worksheets+for+2nd+class PDF link annotation
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddf0b23990---77250188562.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/zavusiwivumusimovitabub.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/dufidevazuvo.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/pememurufivawodinenu.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/pazutun.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8eb0c52eb---68885414507.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wamizoderabemikusepi.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/46569096316.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/10853869463.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/sufimukesikimixewamoxebe.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76fbaea2e2---33884833624.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/cae64a56e94628f575a0eda59912c245/vixisoxufebavivuneboxose.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210830060431_uiyx7d.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/93841849399.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/gapudoradisideboja.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/tafobukexalepageta.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e9b75a56---lifeduwatufidukuketosok.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eadd22f409---83496370704.pdfIn PDF document text
    • http://stroykap.com/application/views/stroykap/userfiles/file/28458753308.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/kagazorok.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/6b97a9a4413f4ec06502d0bece9ac1c0/35379117086.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bedasuroxekomakunoraf.pdfIn PDF document text
    • http://protok.pro/upload/files/sixodanukowot.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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 17768 bytes
SHA-256: 08a68b59a4f9f4caa52e226dec1315bb66cfe887fcd2bac59e9829361558b092
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 11212 bytes
SHA-256: cb7111f47c33ce66e2f8e9dfd2a1cc402ae017859b10720af3c44faaec6c9248
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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