Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ed38d86340e352…

MALICIOUS

PDF

77.3 KB Created: 2021-06-26 04:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4970d9acc08412d05cd9a17a58619c2 SHA-1: dcb21ab8e1abe2b4fa683509a83f68167ee90233 SHA-256: f8ed38d86340e35283431ee0d246f3515c681c11c00e7558efcbcd520abd35ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://afghansolar.com/userfiles/file/wikagu.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/420e3cc28d6acfc479c26ed3cf1977d2/jixafidadopinajowewibak.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086425556ae8---rodubilubodanuzagilonox.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d938b8c13a---44351726427.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb715f033---60968937912.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b056a013b8---gifakarekatotaxadivaxin.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab36c0a1f3d---3971696651.pdf
    • http://ankurgroups.com/userfiles/file/goregiwori.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9c4862dd---jebazojibelileziwa.pdf
    • https://kuepancong.com/contents//files/72649792786.pdf
    • https://panificioilcavaliere.it/userfiles/files/18196777799.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607459ac92c29---godukolewakeroka.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c54064f0fad---89558051534.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66150c19b---20032883084.pdf
    • https://chaletsuenodesol.de/files/50874643954.pdf
    • http://vhshf.de/File/33305357753.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/3gue8535sto50ealpp3dnupliu/nujatiwagufexagur.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160744a2d5a5ed---wogewapopexixizuxokosi.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5fe1b58df---sapunararojijilapuwurepi.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a647515d800---51717256076.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9a2465280a81c0951bd015c6d46b446c/kakiki.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ba705b246---12549668723.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed4a39f4bddd2fecc61b94acb287bf20/labujuposozi.pdf
    • http://bulk-supplies.com/userfiles/file/pugedipuwejefubebo.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096677bcb424---zutogedolid.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878c7bbc87a---61617303025.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=now+and+then+full+movie+watch+online+free
    • 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_off0000cb65.bin
5bc5fc6c722dfb6c83dbb52e8dbdda1b6b7e4578cb53f4ad6e282e4a942ef165
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 16620 bytes
font_01_sfnt_off0000f690.bin
e27b9bd2ecf86241c3cc7272e9a1bc1e80df364c74deb7a084ce1fdff906f723
pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 10800 bytes
font_02_sfnt_off00010f48.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 16792 bytes