Malicious PDF — malware analysis report

Static analysis result for SHA-256 28141ce1cce9be40…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 02:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e47ebd132e2d8b4673b19c72b9d7cb23 SHA-1: 3f594192cd771eaadb80574d55643e429b2fdcdb SHA-256: 28141ce1cce9be406d2f499dd2cf4927d4a61805c4dbe3b4c54f74aec67eba73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=productivity+planner+pdf+free+download PDF link annotation
    • https://ibshospitals.com/userfiles/file/83246100728.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/29357999851.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730aeb64fd4---99623704790.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d294e33bcc---xapokuzubavunobudulosokej.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/98124717591.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/wiwijapazasogobugonogogoj.pdfIn PDF document text
    • http://kingnature.ru/files/files/nevivevubipijawopaku.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/pukekaf.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/77744040384.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8110707293bbdd1797d6afe4217e637e/1728242665.pdfIn PDF document text
    • https://olterus.org/contents//files/gofuvuw.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ad0bef57d3d8f0c92dde8163af304dda/numinuruwotigereb.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/beburovidiginavus.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/bfa03f23314df86ea80f2e9a9abbb781/43467557790.pdfIn PDF document text
    • http://mousike.it/img_ins/files/60339022635.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/88173995a6ea9f2ecde632ac58c0e822/34293397158.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d3ee8d57f360b50243ac6cd75b8881ed/domujafuzilakino.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73ef70eef---nerufanorigat.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/lapopegawedid.pdfIn PDF document text
    • https://coevent.ru/upload/files/58463158524.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/20283056209.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/31i7kss0dpj5pmt1m9k0g99oev/lozojiw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c5c6a6882---tilugujavuminorizanelos.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/353a5dc50266d01f9026b98eea942278/boledux.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821664e9256---99126301073.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/fc57f77e45c40c405eda25b80a07c902/58495653611.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_off0000d2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BB 18296 bytes
SHA-256: e77e5afbb5714b66d5d2818287cc98786250f1635a46326cb1eb8469796dde58
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10812 bytes
SHA-256: 01b2e04febaa810d3bad3274c8f22db0f4e8b8fd50424acf73d53b31528f9bb7
font_02_sfnt_off00011bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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