Malicious PDF — malware analysis report

Static analysis result for SHA-256 59710d7496eed420…

MALICIOUS

PDF

69.9 KB Created: 2021-09-05 22:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3954684330e1dd28e4c6e8684e38b09b SHA-1: 47e7a594305bdc0e73cdafff406a7b192c6a193c SHA-256: 59710d7496eed4208f70b4923cd8bb057e240779f41afc69e0b1b59aa66d3265
126 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV. It functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious sites for phishing or further malware delivery. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4591

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 https://philabc.ru/uplcv?utm_term=travel+vocabulary+test+pdf PDF link annotation
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6e0e99654---90559488553.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084ae8688895---witerorej.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/33388745482.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/92843287244.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de784d9b362---23162084099.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c44f5dc2596---64295821591.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/vebobamujanaz.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/47637375373.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e86b8888---bawexerajawotaxoz.pdfIn PDF document text
    • https://songhong.info/userfiles/file/77997512052.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/pupugebufuvu.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161043a08755d4---mekivonazipowariredume.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/62782415461.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/58484007106.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/rugefegako.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/00ee8mg7soj3ho3trvapog5tp7/60504271455.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04a26c94b---4510528758.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161210874511d4---64484031134.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6336e859---93886005851.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767cca379ae---gijobujaji.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919f69a9d52---85549025737.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/derasiz.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/h02krku58ctqvonc5iq43jc14v/nowufulejikoled.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/86722871441.pdfIn PDF document text
    • http://centronegozi.com/public/dasewijadob.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/99231708255.pdfIn 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_off0000bca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA9 10800 bytes
SHA-256: 3a83460c3050cc471d678ee77f7eb9cf6145325db688e6d43b716459af4daaf6
font_01_sfnt_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 16236 bytes
SHA-256: fb9bd5f44bd022684aa9d2583c4ae86c149487363faa50804b4590cbb862cffc
font_02_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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