Malicious PDF — malware analysis report

Static analysis result for SHA-256 390057b7a89096c0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 23:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba6f53bf0189c1eb00ca926f6b0906fd SHA-1: c873663a12aefca803e48835aedd9f344fb88488 SHA-256: 390057b7a89096c0f166f994fe0acedea8e12de5952453b5e08e8bf7c295c21b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and compromised CMS upload links indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=where+to+find+file+manager+on+android PDF link annotation
    • https://turismopontevedra.com/ckfinder/userfiles/files/40705855036.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8dce59a31---vorawepuzenenulidiwaradej.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/tatabuk.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/mawopulej.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/86469083512.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/202027744.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/12512164007.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/78744680733.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/fuvopubemuxadesegomud.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/51375031122.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/judujefemidezelaxevowil.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/80249865441.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/13742262844.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/23223014490.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917064223_3g09g8.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee685a899---wojoratovixuvitotugi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7e692d71---36393772534.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/7762609392.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3f527bf7b---vexakegejigav.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/51098571872.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/pajusemeginekeveduwexibel.pdfIn PDF document text
    • http://ubest.ru/images/file/79720203442.pdfIn PDF document text
    • http://tid.vn/upload/files/12965828489.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/bukomudijux.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/vimubolisamanilinagimet.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_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 19220 bytes
SHA-256: 09463c173857abc083a25209f7b6abe059528d0136a06810f69854e2e95a0a8f
font_01_sfnt_off0001180d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180D 10628 bytes
SHA-256: def3c704219f2d27440ecab37cdb0417f0b03356f7f84febcb72f2f14f77ed33
font_02_sfnt_off00012ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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