Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c501600aa06135b…

MALICIOUS

PDF

105.1 KB Created: 2021-09-06 22:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f0fde843afddb11336d7e90683383981 SHA-1: 2a5e349cc650da2bcf416c399f3b786e16657eb5 SHA-256: 9c501600aa06135b0b44843bacaebdc71f1f6836d2b87fb7122384f2fc06aba7
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4188

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://immo-cjeanpaul.lu/userfiles/files/valoraj.pdf In PDF document text
    • https://0286869143.com/editor_images/files/sepedigaweserenap.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/20397706585.pdfIn PDF document text
    • http://boxethai38.com/upload/file/79443587578.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9822acf6---votuwijudukeresijomonukuk.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/rafalamogumiwowomelimawa.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf433e364---50710210850.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c996704d8c2038305326d6dab622753/fitububa.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c5f2e638---79833704586.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8e1010d67---81254080104.pdfIn PDF document text
    • http://lamay.de/userfiles/file/14952656926.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611292f556cfb---42833026798.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904160bbe7c---52366840218.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/banuxabikejefom.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/ruzukenupupikirakufufub.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160803ba52de04---60248234188.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/nasojurisimitijepepobeza.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/45133957656.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/35815106033.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/58649913307.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0963f1fe2a---zaremuginawuzitufi.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/malutimaxafexamunezududo.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15539852137.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5fe1b52407b385ea91f368166d3e7fc/3007465037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tico+tico+guitar+tab+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12231 10548 bytes
SHA-256: d09b2fc68430010d3072d1cbed0a52b4653497d21da1e0adf41d2ba9cb9b4fce
font_01_sfnt_off000139f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15205 22280 bytes
SHA-256: 67f7055f69af93d96cb2c467afa7d3b07e8f3810e508e347bd8c99cf7a72fb3c
font_03_sfnt_off00018bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BD1 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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