Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b1313fb1b4861b…

MALICIOUS

PDF

93.1 KB Created: 2021-09-08 11:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2dcb095c943735ed19dcfeb2919ae3ce SHA-1: 6f544dcab57f58a103ddbe4b5e7ff34023af6ae9 SHA-256: 10b1313fb1b4861b9f8d2f8ad5b5c86bcded363c2097e81b81d6b8844e3ec65f
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, embedding numerous URLs that point to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to external sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crewmak.ru/uplcv?utm_term=semiologie+de+l%27appareil+genital+masculin+pdf PDF link annotation
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eeffe1aafa---wezijifoxowojunuf.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6b195bbb---xufozi.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/420e21a78bbaeb345c124b1b481d2bd7/katomigego.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/47220601472.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/riluwedawozijimomebezun.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bdef9fe78---63332486988.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/68150488474.pdfIn PDF document text
    • http://tcihk.com/userfiles/duwox.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/soxegewixisudif.pdfIn PDF document text
    • http://charontrade.hu/data/file/21955099175.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fewub.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/adeu98pkiu6ligrronq20tfua3/ludup.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608224c4c6f6c---bebawi.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/miwidirakewifa.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/71204161368.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2a5161645---30992209853.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/kewonazekafe.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/39039074280.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/fojotolexofobow.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/gonitufezowajiluwefiti.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a156ff552d2d59c5ac253246eb32d9c1/86031929509.pdfIn PDF document text
    • http://fkhd.cz/data/img/zurifizalakaz.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/malerapizo.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_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 22140 bytes
SHA-256: 1bfea7cd250b19201df661383ed3f8861353bd2fba2bb9b243f53e6caf7f87f8
font_01_sfnt_off000132d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D4 11172 bytes
SHA-256: ce27bf4e2d8a4d07b8246eb6dfe03ed692d892180913737d2242c3e7a113accf
font_02_sfnt_off00014cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1