Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9d4c3d133eb3a3…

MALICIOUS

PDF

75.4 KB Created: 2021-09-12 16:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ba5f073fd319d29577023bcfc3efa13e SHA-1: 6f7571345e61187799d9ff6e440b4aab684363e1 SHA-256: 2e9d4c3d133eb3a3489aaec442762dec6fca55d9c487c0d17be8c72ec9fa385d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear textual lures, but the heuristic findings of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM confirm the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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
  • 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://leciv.fr/uploads/FCK_files/file/wanepupof.pdf In PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f1b794f00554a104c92d5b427f5edbc3/60949732199.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/dinaravejegotabudoxo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132e8b66ada6---binipikisopamen.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/denafapoxajusenak.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/5fc0476a184c5c1a2f1b88c08c2aabee/59665638414.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613605a64ec21---39653730273.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/17016598763.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/11158603334.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/zuluw.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/67194620611.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/mosaruvuzexoxavomajas.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/kopiwuzupikosewad.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/39522405913.pdfIn PDF document text
    • http://gzwep.com/img/file/202191205919.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/18185593.pdfIn PDF document text
    • http://cordovajewelry.com/images/file/vasur.pdfIn PDF document text
    • http://e5tbr.alruaa.com/ckeditor-ckfinder-integration/uploads/files/95936995584.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/50940458414.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42625146046.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/51975959342.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613005bf4515a---17320076707.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kobumodip.pdfIn PDF document text
    • https://fivetc.net/uploads/files/24768535766.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/79045746963.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcead0ef01---sosupejat.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/zuzudezofixate.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=super+vpn+free+vpn+client+mod+apkPDF 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_off0000c471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC471 16240 bytes
SHA-256: 74bbba2c68a9728f147f2fc42a6857fe5c638fa232df42a9dbca20197490e5a4
font_01_sfnt_off0000edf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF6 10944 bytes
SHA-256: ca111a338aecf73939447d54ef65955d9a0c454e9be115965da3e304d758c49e
font_02_sfnt_off00010756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1