Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f62b61c2fa44e6…

MALICIOUS

PDF

126.2 KB Created: 2021-08-06 08:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3d8073be01ab2e8507b88962deb5ea7c SHA-1: 7e3d3a654eeb2837c52cb620d71eecfec0a650e8 SHA-256: 28f62b61c2fa44e6f0edbdf7249f84872a65e97bb450f709099121962a5b1a2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites hosting further PDF files. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users into downloading further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests this is a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6571

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a2627eec7---tenoviganexe.pdf In PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074477638d8b---7652918336.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/xigapo.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096e01f0f437---31440662035.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26329502811.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc22f20af2a3b207f913ed12764cf456/gemuvibuvedo.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/37217917327.pdfIn PDF document text
    • https://tl-systems.hu/files/files/dozevamoviza.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/27815658513.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0809c27599---zuzilobirumu.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/90362362777.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/dajujuvagezoxojezof.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/61870507367.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xemurowisozigekonaw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f92a5626e---namubalafofepagezegodis.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/slb1p254fkg7fmv3u098nmebs8/30195400119.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/lonafaja.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/934c190b8584b7179acce17288cc7797/zejanaxudomemujotu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5vmtmbtj6e1m5092k2fv5sgtk7/bipopukudod.pdfIn PDF document text
    • http://banquat.com/userfiles/files/rudamuvawotakuzup.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f5200a80e---berimunudutonusap.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/kodixuvapakexirodaduf.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b15cd1be6---57553152581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=amazon+echo+dot+3rd+generation+essential+user+guide+2019+editionPDF link annotation
    • 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_off0001935c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1935C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001ab73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB73 11592 bytes
SHA-256: 6dbf5a030c55fb6972a2e8a8f41c8df74aa3e0f749a17cc82d4faa4d4b0efc35
font_02_sfnt_off0001c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6BB 18708 bytes
SHA-256: 8467543861aa405daf7c2f94f50c73b7a37e6218f0dcbe1b31a7076ae3bfec39

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