Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3899e4afcf09c2f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 03:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 502a952550bb5e7a321fa6564121c9ba SHA-1: 298fc66ed97d9acc3fe497be3df2860ba0c4bd43 SHA-256: f3899e4afcf09c2f07b015232066671bdeeebdf1fb63bed9e7aaebdfc860adeb
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised or disposable hosting sites. The primary purpose appears to be redirecting users to external, untrusted content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7657

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://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/71781507465.pdf In PDF document text
    • http://fueandhair.com/userfiles/files/24532662154.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ab067ef66c80fc9c3a6f739923a2c2da/levifezefulanoxajudanigi.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/46230508501.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/90158777881.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54157386810.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703d9cee718---35509354139.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/43383132068.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/47720550919.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae2d35ad90---kilufakobazipofow.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2924a885b04d1c668903c57e64f55fe1/fojoweralun.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/85999181545.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/867866fed54db6c8d069b22bdd81a500/melokixajikebulezido.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608719364384e---60873854624.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/8uh1c2f0ra97tlvgov42sdnoho/xegalutu.pdfIn PDF document text
    • http://alkanboya.com/files/file///fawavukadakogobuti.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161085a969b57f---88287051444.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/zisoluni.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/52747880471.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/absvvj36p9bd8l0049nldj3qv91r90rs/96697381923.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/60493166325.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/barigevifubufunifujusidi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609d560293ea7---xanizarudefode.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lacanian+psychoanalysis+pdfPDF 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_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 10456 bytes
SHA-256: 7966f3f99c3622a8fe98762e8ba30cb0adb31b88fbbea0e38e4670177c2d62c4
font_01_sfnt_off000101f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F8 17688 bytes
SHA-256: 1a5d2286487befe09a389c5b94a1403cf78ccaf9e35e3ef65431e05bde5ff359
font_02_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1