Malicious PDF — malware analysis report

Static analysis result for SHA-256 75e05e6b09add303…

MALICIOUS

PDF

87.5 KB Created: 2021-09-06 18:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2fc1dce3605950bf5678fe4fc53f8fce SHA-1: dac063e3ce3be059ae2ea91f0dc47fb4a56db29a SHA-256: 75e05e6b09add30320aa773c2f4e83f1a42991daecfc0271bf1efce535ed5203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on directing users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://queure.ru/uplcv?utm_term=programas+de+inclusion+social+en+el+peru+pdf PDF link annotation
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60548c089---61531569371.pdfIn PDF document text
    • https://svltv.in/userfiles/files/89646989225.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f4831b444---93513652161.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5eia421hjru3t7q6v6rp1q7gdj/14196224289.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kitewerukorusibeka.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/xetafufesikajurej.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/18693866432.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/delasevefazepedeweb.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/12496931824.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/9fe5333ccb9b77c048982eb1a42719d0/tifitolibiv.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/zanusutevibabe.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c72f71a31---94156206949.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/mujetosoxorazikefusona.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/65398983155.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/9357690549.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/vabugebofugoxe.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/gegudeworuri.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/cfcdcc661e3913924828dc7fd6e921e7/45751480271.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/vuduxarizubowi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/buvatosetiduxok.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/739d18663a3d8942f3de7512e6564e83/8720608442.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/25170511700.pdfIn PDF document text
    • http://domario.ru/userfiles/file/26578664087.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/29049301245.pdfIn PDF document text
    • http://pgnsualumni.com/clients/872691/File/69803475170.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d288587df2---mefeduropeku.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/7481250927.pdfIn PDF document text
    • 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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 19240 bytes
SHA-256: 1fd4d0310e5291e8cb25724f79d1d018ee038bb506836cc70a646b365c79dd5b
font_02_sfnt_off0001352f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352F 10968 bytes
SHA-256: 0d5e637ceb50f8bc2432a0094d6dc6858735f84932a34f29f846cbac0df37fd0