Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffeeb5fe211914f…

MALICIOUS

PDF

79.6 KB Created: 2021-07-18 08:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8e1ab8a98fcf2a60ee4b19f72ace49f SHA-1: 5bcdbceceb140933552b192c5d6e1b6077d926dd SHA-256: 1ffeeb5fe211914f1719531e85748e160b53fe89215f6575cf68c752f04129b2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00cdb918b---raxakukokewupugimisituni.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b600e55f29d---58670519983.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d2aa13ecd---30160812391.pdf
    • http://firesecurity.sk/userfiles/file/kipuwu.pdf
    • http://brainerdhs71.com/clients/0/08/084bd9d902c6a1e3ee48703551c87841/File/doxopusodid.pdf
    • http://dedanskecasinoer.dk/userfiles/file/28259016961.pdf
    • http://jjinline.org/file_upload/file/45522451849.pdf
    • http://elijasprojekts.lv/files/file/55997930765.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/ic16vlfv62noejj8b0e2tv2d24/wawajawobeniruwegarebiper.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a251b03ca---gedeti.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d7132162795---xijulade.pdf
    • https://rajaketiga.com/contents//files/kixunotivojunag.pdf
    • http://esipro.fr/userfiles/file/84664612074.pdf
    • https://ctapigroup3.com/contents//files/libimowemibiba.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e437980def8---fanulosuxixanogepu.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e43c8cb4526---zuxirixorivaxorufa.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/bomebofiwuporapimul.pdf
    • http://abwlargo.com/uploads/files/24871236825.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4859acaeb---50678767448.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/o4sp0a3s1d8j0cmmmcteq7vdvr/donesezerurugunejolofen.pdf
    • http://medica-eg.com/userfiles/file/57386197013.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1460e1ae---88031036822.pdf
    • https://alnahamgroup.com/userfiles/file/65970143358.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/29680183366.pdf
    • https://betalinktech.com/blmedia/file/givaru.pdf
    • http://flatadministration.com/uploades/fckeditorfile/56800356197.pdf
    • https://pharma-tools.eu/galeria/file/13949925710.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=south+mountain+state+park+hiking
    • 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_off0000d3a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A2 16792 bytes
font_01_sfnt_off0000ebb4.bin
928b6cf8cc4115c73d7acf646ad0cd63cd540296c0ff86c8847b4da299ae42f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 16792 bytes
font_02_sfnt_off000117c9.bin
3f1c955d463f50f5751b1f75495f4aee0c40ab3db40de46efaa848d481d21ce4
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 10920 bytes