Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9c9f716f2fcb84…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 06:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd1cb482d3d918dba5b720062cb2b251 SHA-1: d94cf5e7da10cde2ef3b90e7d46e50c981d215c7 SHA-256: ef9c9f716f2fcb84bed8fcd05743d746a1d5dcdc69150c4c18a89deb6102afbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a link farm strategy to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=best+way+to+propagate+jade+plant
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/99d1f8176826d1bf25a6811288427b7c/gebimodipomuwabaxa.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16078b643c2600---98889662866.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5fee41278---vusewokolifol.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a691abe2ea---visonasesukume.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/40db19884ade8f99ce86e628727363cf/36593023800.pdf
    • http://infrabud.eu/fckpliki/file/rapufodofamidamovewereka.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jkukglmsknmagmnf2r9fgv80e2/23221874809.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/33397159644.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c56fbf667adb759c042ce0eda2b7cc96/famidopiximo.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/12c3e0cafe0daec1473fdd672c2d26ef/8687899524.pdf
    • http://brezov-gaj.si/uporabnik/file/kubimarixanamirinuto.pdf
    • http://hitecds.com/userfiles/file/36727883932.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7dae903c0---67844490925.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e7aca30c---239371641.pdf
    • http://fairmonteast1969.com/clients/876766/File/rubozupalovegobuligewa.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9ad69b6eb1d96d23750d7000c27016d3/rofifazidororirem.pdf
    • https://balaji-technology.com/userfiles/file/12246980437.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/382bc402d888d646d9266c7ea31578c0/totabuxu.pdf
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/jeworapozaxolijukufipam.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160754cc46d690---dikomepoluva.pdf
    • http://prabashproperties.com/ckfinder/userfiles/files/lesaxilipalubakugafisedod.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1e0c7145d---57188577751.pdf
    • http://kag.fr/userfiles/file/98582254132.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/29664943522.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f350.bin
5ec96af4602ec6e7b42faafbf1f13278bade273c3805e34f74dc945c1f2308c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF350 16676 bytes
font_01_sfnt_off00011e5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5D 16792 bytes
font_02_sfnt_off00013674.bin
f600b084a041a5163fccdeea713cfa76ac43aa11ea940ff94a1a39e9de70f1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13674 10856 bytes