Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0862ff532e7782c…

MALICIOUS

PDF

79.9 KB Created: 2021-06-29 08:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 871fd3fe45f546adf69d0077483cc31a SHA-1: de0752d34c56709fc7e1c5d38d67458d25efd3c0 SHA-256: c0862ff532e7782c388786cd8c1b6e629524c383242e8f2a3ffafeec0c51b894
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. The document body is heavily obfuscated and contains no readable content, indicating its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcc689cef---7491702861.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4d3bcf6cae3c4ea52b7a47d7c3cfcb42/55363393290.pdf
    • https://harkakotony.hu/UserFiles/file/kabedu.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730335eb379---bovatugivisex.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/21348327761.pdf
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/18329536094.pdf
    • https://habibitours.org/ckfinder/userfiles/files/nimavodujin.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94ed85e33b---gosixedusunesipolapubari.pdf
    • https://relans-nn.ru/images/docs/file/88556526537.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f08f2eea1---6064930882.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16072c471ac9d7---pemag.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6386efe9284895dfddf89d2642978d6a/bodijapogo.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-25/20210625092518227908.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/165644864790e157692a56e63ffa9106/14541427871.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073c384b1c62---54898229167.pdf
    • http://www.aqsclimited.com/EditorImages/file/53043471368.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088d8c960a8e---reronojonate.pdf
    • http://fiumaradelsossio.it/userfiles/files/37345599854.pdf
    • https://liniagdanskzydowo.pl/files/70659607471.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ajk9ujob6im23j6rrm8bu36s65/siletofemujurolujebot.pdf
    • https://trunglamdecor.com/uploads/userfiles/file/dinewumujowenox.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcmu5ts952nn3jo4nsr2omjjs7/wewasupep.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b314854dc5---sorozil.pdf
    • http://bsbcarpet.com/userfiles/file/zabukinotor.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/u9euiiub5c2dp2c7bjnm3d2og6/demerurixelekudo.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e57c9ddca7---98557381702.pdf
    • http://kraski-chernila.ru/resources/file/labeladixofewuxota.pdf
    • http://tumwebthailand.com/ckfinder/userfiles/files/mezibi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=perk+place+coffeehouse
    • 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_off0000d52e.bin
0deedba791bb032ba7c42e995a3bb9f6f3585f9dda42d40b01f59fdf3e58d498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 17228 bytes
font_01_sfnt_off0001022e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022E 16792 bytes
font_02_sfnt_off00011a45.bin
2d41f1bf11a57aa4cb5ca0964ae0848864aa49c173b6caadb1a93eb280ef40c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A45 10476 bytes

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