Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cbc0447c400cc9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 11:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe7041198d3c16d9475c8ff8cf5cfb3f SHA-1: 8047967a671a5b7f21d7c1b5c91fcdddf568102e SHA-256: 65cbc0447c400cc9af2f4fbc22f11608b70817584f42bdedb85a5221b42b6984
154 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of multiple compromised upload links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5017

Heuristics 5

  • 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
  • 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://dxczx.com/ckfinder/userfiles/files/20210814_141111.pdf In PDF document text
    • http://jar-ted.pl/file/musajefidewoko.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/74426249000.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/j9irenlfabh344p1t4qu6phqp5/juvirifufefulibavar.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbe26e1d7---nisezomeworupeborinujefu.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/44504541614.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fec9e5d5736f6d589e9ffa9e4396ff3f/76453968200.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2ca702b0---tijezigerojal.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/11570715365.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/82862876575.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/1698462525.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4bfe484e9---50435118548.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/9637834379.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/zudesijuge.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/xivopaneridi.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/20baae83bf8881bb06b15520cabd7f0f/27641429714.pdfIn PDF document text
    • https://petala.gr/userfiles/file/pumodokubo.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/76281238803.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7d182d047---31608226404.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/taporiguwukutinivuzefis.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160821d14b6f6d---70741102850.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28692a3431---vipobunisiruwub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=notion+d%27orbitale+atomique+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 19424 bytes
SHA-256: 9a9f4076c8bb0a81950b39c671c3685da0962a6db24c32d7b2b4c33925d10ffd
font_01_sfnt_off00012387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12387 10888 bytes
SHA-256: cc5f25f5d0a86df69c0007a4f842f472ebf7f98f78512747683a9e8515c79f82

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