Malicious PDF — malware analysis report

Static analysis result for SHA-256 9468c5f10bec0c34…

MALICIOUS

PDF

90.0 KB Created: 2021-08-08 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e9ef9981cdc0347c0b49d28644e5e039 SHA-1: cfe2733a72f10f390000bfbb4d8a3e10c20dcd90 SHA-256: 9468c5f10bec0c346683d800f3391846f986619b6fab232046d5cd516dfcbe4d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. Several heuristics indicate the PDF contains numerous links pointing to external websites, some hosted on compromised CMS uploads or disposable domains. The embedded URLs suggest an attempt to direct users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://kanchanaspa.com/ckfinder/userfiles/files/57736113817.pdf In PDF document text
    • http://mobiliteit.nu/files/rarezadirutesora.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/80536060857.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2d96a382---gorusuzoxesedodiko.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ad98f918571be15ed5b4816bf616dc6c/30975484953.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sebelinavutatag.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/704f912552d5df761a3b49fcfdb0f628/zamoxatumefex.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/fovebasorulelerenotilovex.pdfIn PDF document text
    • http://didopack.com/files/xenufed.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608857eda7885---7154531136.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770d115edee---benelomokimoxokatozemakek.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/55385095731.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfbf178aa---95489002892.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2d37c0798---zezexifewavurabakofurosar.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/96880832533.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/44602232387.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608347403c421---nixaxibolanewopivi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/20924708221.pdfIn PDF document text
    • https://rm-parketi.si/uploads/40510817975.pdfIn PDF document text
    • http://sam-global.ch/files/file/ladasudolexexasudobim.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b5617f90---77263935414.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/9eb2900e17b2571902571652825b2339/38575880312.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/0d83c188f583c6338068bcb7f0608613/sanezafisizodonezej.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1e93f093b5b4b69bc649643f2f10ded7/14851576371.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef43ac848---7624667961.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/72c8895c1575ac7244b9f518f7ceee0c/ridupozafiforajotozuli.pdfIn PDF document text
    • https://camelcarpet.org/d/files/noxevexuxewoxelopiloje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=jogos+de+tunar+carros+brasileiros+para+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 19560 bytes
SHA-256: 70c3c7f16b4c5f652b3b2404278eea88f5876e08be3c89e790470cb5a69d7945
font_02_sfnt_off00013e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7C 10920 bytes
SHA-256: 7aba4d7d88fcde44bde2da2bb13eb760f2d2fd83e34b4cd6781799008ce88255