Malicious PDF — malware analysis report

Static analysis result for SHA-256 267bf7d3773e2483…

MALICIOUS

PDF

90.5 KB Created: 2021-06-27 15:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 02e15baa41c8a77887acbae3fd1b7eef SHA-1: 31c9e05702ade68d9266f7c3cd34748f2b0e9afb SHA-256: 267bf7d3773e2483b083dea852ef63e23bbf210aa37230298180909c791e5ecf
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to other PDFs hosted on compromised websites. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities. The presence of multiple compromised CMS upload links reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://haps.company/wp-content/plugins/super-forms/uploads/php/files/2bucop916thng0tiuicr8qvbr1/sitovitasanopolutitedesig.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/zajulinukijodonomiripefax.pdf
    • http://morethancars.nl/uploads/edytor/file/tugefituwa.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aae5e76f3.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/9c2bc616b0151c45b9c915c1054116d9/xatizukoralomuxoketej.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083b95676969---92086751535.pdf
    • https://bojovicsirogojno.com//files/ginow.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/36a9a6cd0c00edd163d6846ea649a32b/17192953582.pdf
    • http://fantalife.nl/userfiles/file/89147842201.pdf
    • https://arvikabc.com/images/uploadedimages/file/sogidolezuba.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5047ae04a---moriwonumotofasefodusotu.pdf
    • https://vietfun.com.vn/wp-content/plugins/super-forms/uploads/php/files/tmi2aga58778ntgibkkccc7ila/84712470723.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb4dd183b---77670658187.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e1b3d2e2db9a4c21fdda9118b25bc0c7/87436336527.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/f4il0rg0ru40hpqhm2u765and9/28893979663.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609759344432e---depesozepoxanafejaxenutu.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/208c32aea1848ad0bec85aacee599f02/litikorebatogab.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d627948f3---kovex.pdf
    • http://fujavietnam.com/images/Download/39121646931.pdf
    • http://messtores.ca/fck_user_files/file/92011965000.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d304cf0916---fakupubexijowo.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7763de446---wenewedizatodofasar.pdf
    • http://imaginove.eu/data/Files/sizosogepowudufigagezogu.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/f2b4d6ca4b8d3f2e9afabb721cc10a15/fomagalov.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5f6827e4---39035041792.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=good+words+that+start+with+u+to+describe+someone
    • 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_off0000fc66.bin
87076a339b17296a530e5c6f21a688406d2284ffda3229a2a987300bde88906a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 17212 bytes
font_01_sfnt_off0001291f.bin
1410cdd3bc6abacdc6b3fc5072a8ecfc5a08d47dad9a33817407c36ac5bfd212		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1291F 10956 bytes
font_02_sfnt_off0001426d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1426D 16792 bytes

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