Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60a6566ba391b60…

MALICIOUS

PDF

91.8 KB Created: 2021-08-11 23:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b1713158bae18e550c3a9f20c8f8086 SHA-1: 1920357f668d65eb36046e1c776c97cf7086e1c1 SHA-256: d60a6566ba391b605e7afb7c8502591574f118c42ccdb7d4bc4b16b48063aebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to domains identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution align with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://tavio.ru/files/file/43818175026.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075afac133f4---57461817245.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/galeninesubujotanuvobed.pdfIn PDF document text
    • http://renovator.cz/files/file/zipafutu.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/vuwumukobenegemuwi.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/fizavevizokufuxat.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/50021836524.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/wuteworijipukoli.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/22204734610.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/78546538820.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/i6bmdd7veqegnikjs28317on9n/39763748348.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/dufalofebedofabufe.pdfIn PDF document text
    • http://intergeored.com/upload/File/solumojapajif.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a89b807e895---19670425330.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/simafuziwusefazonuludozo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/47b95ab34578368d1f1421914e49d17d/76961453056.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607358156040a---34051952533.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/tavevaxuzojixidu.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/66453994754.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2e69ead5bf0b2913c2d9aedd8a590174/tilupomoxuzebelig.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fawegijabodeluvejonawezo.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/97011385904.pdfIn PDF document text
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/92045547739.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/zasagusevexukalelav.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/gegasukedinenesomudoxaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+clean+cuisinart+keurig+sidePDF 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_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 18312 bytes
SHA-256: 7d078b33e91286494d216699a30a207142a1b5e45df5acbcc87c7b841a97d7c0
font_01_sfnt_off00012d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 10816 bytes
SHA-256: 9792fecc043f6b296fb68f27947b62ea1dba8223b5e04f5049c4497c180475aa
font_02_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1