Malicious PDF — malware analysis report

Static analysis result for SHA-256 9804167c629a24d1…

MALICIOUS

PDF

86.5 KB Created: 2021-07-03 08:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a4d54d71b94092b4a1f58ee51e84112 SHA-1: fec5f916db6727567bcdd1d7d0991f19786c711b SHA-256: 9804167c629a24d1580cfd870342a72857b70ac9665e647d6afc1d6dc27b9ec0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded links suggest an attempt to redirect the user to malicious content.

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=what+can+i+feed+a+ferret
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/f3f4088a2fdd62ad5ee32d6a1e02b0cc/96028045443.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/693af2a4df7b81cabdfe0eddf6b55ebb/30368485669.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607410f96155c---bonadogadulawaxufixisimuf.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084c31ac62c3---6451303945.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43548a352a---10442875281.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mddm8feo3ee59n06rnbr5m71ri/milivufugujixalaweti.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089b89e3701b---pexiborakim.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ef8766f67---zifemizapazuno.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8e8c832a---97200443008.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4u7l99g97mtiko7fj43efgnqkn/83053612018.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c0b094dc---35939600937.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//vuxejisigozinefa.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad401697f86---24605830443.pdf
    • http://greenbiotech.vn/uploads/userfiles/file/46448590861.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc91ee3c95---87850387739.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbc37ee173---73619339932.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075220ae7e9d---26364147891.pdf
    • http://mppscstudy.com/admin/usercontent/file/galowigaroxurokubizi.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160729bebc5a32---kusopasexavonot.pdf
    • https://goooinggroup.com/userfiles/files/20210622_221805.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/kezixob.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160957e6dbda69---lotiz.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-16/20210616221033332819.pdf
    • http://anthonyvienna.com/sites/default/files/file/lurijujixujexekitize.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_off0000f068.bin
c1e17c861822618f7a70b3d1c87669fc893efb577e6d3e6ab8341aeaba80dc65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10232 bytes
font_01_sfnt_off0001074e.bin
6b89b86bb231971a3444b5ef5fb24448fb4a2064bf4b186480f82f1f6f3a2c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 16804 bytes
font_02_sfnt_off00013317.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 16792 bytes

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