Malicious PDF — malware analysis report

Static analysis result for SHA-256 759a0415fc931fc3…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 22:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: c4f2c2b2d16150a162df5d1f260d1d40 SHA-1: aaa5a675e2f551b17e1e327957aa1c4bce89d5d2 SHA-256: 759a0415fc931fc3b37d54b6243432233c1755676cf015f7d33d8c6dc48386a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://magicdiscoradio.hu/userfiles/file/sizuxegitopixi.pdf In PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d7f2f4ca---lelifidosibokosipotisamu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27edcc0597---vupegibusonikofotujo.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/61977655188.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ec97b945ce377cd040b0f2550b47c209/jabex.pdfIn PDF document text
    • http://kite-surf.sk/files/6349092099.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/81539105907.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076759b7b83a---37991337543.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/14672471846.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067de67a01---36529842320.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/xaduwafenogelog.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c3263d4a973---rejapilotumumijevuzez.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/575d0fff281639b6aee5332274f869ef/narimediganajomexexo.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/78581385541.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/napuf.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/72721210886.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/tamefunobil.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/bironujaruzapa.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a69192f23---donofeloza.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/xeseni.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/48488497989.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/sonopiwaxe.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c75c05afa---67474702869.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/dv9gtgjs540d6l9fqnp4oe1jh7/35713113199.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f7d1863a2---27705138169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=diet+plan+bodybuilding+pdfPDF 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_off0000c32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32E 16796 bytes
SHA-256: 2adb51cb7166295a9f9222e2e5658ff414fb8d8e1bf0f268c064729f3cd9fab2
font_01_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 10760 bytes
SHA-256: 401f2e91fe1974872667dbc04108d47ce474d709b634c49a323f3bc8d399d63f
font_02_sfnt_off000106c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1