Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca0439f70f5d6f6…

MALICIOUS

PDF

93.9 KB Created: 2021-07-29 13:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dd4e57da1dabc58414cfe49e93aabe73 SHA-1: dd75e34ad98d2afc1d2008693e4c907fb2780803 SHA-256: 0ca0439f70f5d6f67225ec554eac1b4acbb6efe44348f57e3d78bb47c49e8dd0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to direct users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://czechdidgeridoo.com/admin/upload/file/vobiwibegaporokamut.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf08228cd13---rofibamix.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/1623371304808.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5b36233a8---58475287231.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2857081038---37495265723.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084435e5fcbe---tuloz.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d50f0505ee---16558962039.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e217080f---61406005811.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/jixidovadedewawazesulor.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/zalokud.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7f2071e17f0373cad4c9614dbb3ecc6d/daronetalop.pdfIn PDF document text
    • http://atya.eu/files/file/59819561305.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/jaxiwifafezovide.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/1abf70da0635fabf3ecb6d27b7ae5e6a/jufefubirimeseve.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc14bcb9604---wurono.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6407_20210620052740.pdfIn PDF document text
    • https://luminex.pl/upload/file/ginitiduvokarepefotunusu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b19eae9ccc5---51322683057.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/41555329873.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080d13bb5377---nofasubu.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/27274602226.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/44ca9995bf1683f7d7e85ff789c47e29/97104676992.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/jipajilaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+tres+veces+tu+pelicula+completa+hd+gratisPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10544 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 20132 bytes
SHA-256: bd325df4117aa7d84cdf4bbb11a20b1041d107a7ed25284c9046557f5df11262
font_04_sfnt_off00014d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D65 11024 bytes
SHA-256: e895024ef81d33b85e88556009b070bfea603ca6f15e11186f3f69fd079edbb1

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