Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c15c21e0a8ed309…

MALICIOUS

PDF

78.4 KB Created: 2021-08-03 22:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 234761721308019ac7d47c049eda1cfa SHA-1: b5589b87bfcec4579c92b345aa12e25a19f690a2 SHA-256: 0c15c21e0a8ed30968e37bcbf51cc23fbdbeab02ef88f1d3bfef79d995da522a
196 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. The document functions as a link farm, directing users to download password-protected archives, a common tactic to bypass gateway security. The URLs point to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malware disguised as legitimate downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=descargar+dragon+ball+z+budokai+tenkaichi+3+ps2+latino+utorrent PDF link annotation
    • http://prosquash.by/data/limavedafubawobu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b072f7371b9---27944193786.pdfIn PDF document text
    • http://novichiha.ru/pic/file/77449128345.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/430fb7d402ac77960a2749f4ba243061/12645480964.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/148418529.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/fefaroxukagiribapuwu.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bbeb9dc9c76---2499279579.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/1d7eef954c04877c3cecfba0d754e979/17383882341.pdfIn PDF document text
    • http://biosite.ru/images/news/file/xenimebebataxakoditetab.pdfIn PDF document text
    • https://tekmaker.com/upload/files/juxixafepexuxemu.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k12uma18gg65k9bbus3r2d56d5/61014080289.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/bizuvigadabus.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/54984271136.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/libop.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/fevumo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86b198710b---paletuvalumipepulojit.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/wigomevevokinixudadigiv.pdfIn PDF document text
    • https://asiajitu.com/contents//files/zuvulofuxabanatada.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a3b4eeaeb---7446679881.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/92ca275eb68573d5f7be115b21585292/99581542155.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/52950585147.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f9fa4151c---jolodumijurixe.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/543b69339c5868a8a57e65b123933e3d/48263608949.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_off0000c805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC805 11476 bytes
SHA-256: a323ee6fd4711e3dfc898b3ef3a6e84d419ea9ea50d6433ab6b53ff942bf3505
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 18268 bytes
SHA-256: 7c1a02166c9a32c5a2fbbbba13bd96e3a23aba7e64bb351eff5ab8053c440122
font_02_sfnt_off0001110e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1110E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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