Malicious PDF — malware analysis report

Static analysis result for SHA-256 c828df48884b0a61…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 23:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: be0dcc2740ed185b74dc2749d7e72cd6 SHA-1: 256be8223c694c10a9a8bcf7e731c6154cd562a7 SHA-256: c828df48884b0a61ef97b0a3056c8c4f7fd19636a2538ede0732d4018576cc54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://lycee-elm.org/userfiles/file/jasixaxewe.pdf In PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d325c25ba2---37611867651.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/71932061180.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160791d112008a---mojijijavuxavenapanob.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c7793de2549---52746341019.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160870132412c3---damoduruf.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078470e17ba9---rosoxijir.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1n9c112juq5ijspept31083bv2/53721929143.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/0bglrakp1jjjjqtoa2sk2lk3rk/96090807618.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16084231ae9ba2---nadiripexujifamisakabol.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/felalegedi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e7acaa6a2862174d232035003935b5eb/zosezavosomatovovawev.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/4487661435.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/240731504.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cc2400e1c0---wokejigirijobe.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/47395737264.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/92706083197.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/fixol.pdfIn PDF document text
    • https://lesura.net/userfiles/file/paginedilaxamorudul.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160711986081a9---98344101451.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/74386667189.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d3919ffd3---49595806304.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b167cfe06e4---62509637399.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/mitinigulujozoxativimuluk.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/16157915328.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/15125434737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=motorised+diverter+valve+manual+overridePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 10568 bytes
SHA-256: ad94f6e2b1e52dfd1e76695c53081c140de19998ab65a605379bd084a0b5f5ac
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 17272 bytes
SHA-256: f514f0d2364ddd6b88259664a932c5076aa981bab2f4549df4b77b6ee487e37e
font_02_sfnt_off00012c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1