Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f848f409abaf98…

MALICIOUS

PDF

90.1 KB Created: 2021-07-25 22:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14e4b7b913cb0f9a894268b118b3a5da SHA-1: 1e9d212a805acddb2b24444e9beeeb4cccb3ff6b SHA-256: c1f848f409abaf982a381bef957cdab26ca5ddc217a32ae3f50b57546cc267a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to host or redirect to malicious content. The PDF's structure and numerous links to unknown domains support its role as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ff066b232---41430907855.pdf
    • http://aitrans.cn/UploadFile/file/F1202106061545175547.pdf
    • http://feynburg-uhren.de/uploads/tipovuzi.pdf
    • http://valleypainclinic.org/userfiles/file/wirigajutusasunagejemul.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0f0e8f64---90956222914.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/cea0b9d826212b035c6bd0536dc0bf5e/sajilitogafi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9926d8a75---jojep.pdf
    • https://celebicatering.com/upload/ckfinder/files/53706722544.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f69537e7f7---zepivunewo.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/anirefhtgh3m33irseoilqf8n7/wixusakolivuneg.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a446e671023---10270972644.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160ab6be24f0f9---zulisopuvitibejo.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b1e13ebf3738efe89dd84f4213f30388/voladowexabixanokujinopos.pdf
    • http://campbellelectronics.com/uploads/lumitudaf.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2a6672e49324fc4947d8b4e3c8c9e552/tenoxidexoxebejikafoj.pdf
    • https://digireg.sk/upload/8725408011.pdf
    • http://skiflogistics.ru/userfiles/file/13189353570.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091c7464357b---76762057247.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160945a39a48da---33620566937.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cbiqpd37c3ahi2i60d82h6quf9/41463851282.pdf
    • https://bangvetthuong.com/luutru/files/lujobezawib.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/73k97vleokvm3sultsuj2kk0bl/gewozidetajesoresukaru.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080de81d03aa---wejotegodeziweje.pdf
    • http://hosungtour.com/FileData/ckfinder/files/20210719_6BF7C415113AE61A.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077737e971b8---35455290901.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+snapchat+on+google+play
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb83.bin
448d63f749bbb12e17f32bef03bda01c7e98013ab89014da199484d07d9411b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 17528 bytes
font_01_sfnt_off000129af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AF 16792 bytes
font_02_sfnt_off000141c6.bin
a2c225d002d60f4d62f81f036f26b641c3dbdcc2d3d4f43e48917ed6d565a6f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141C6 10652 bytes

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