Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c031ae57eb39d7…

MALICIOUS

PDF

98.0 KB Created: 2021-09-07 19:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1024381947deb403a28a66728651e3f2 SHA-1: f7e02d1b4c623670b84abae78841f23aec681899 SHA-256: 79c031ae57eb39d7e0d4834c8099f8bcdc656c23bf35d26b4a3ed11f14dc7ebe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document is designed to instruct users to open a password-protected archive, a common tactic to bypass security filters. The numerous embedded URLs pointing to compromised CMS upload directories further support its role as a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/9fcd373a8db5b1301fcaf9fe71350870/kamurexoxute.pdf In PDF document text
    • http://fornacedelia.it/userfiles/files/pumodimifaduwob.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/vhjs3rm47d4d1jsgfcg7ban3mv/temufuxelajegumikela.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/78524680298.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608175eae8321---vexararulabiwinipav.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/dawebo.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfc92d44a0---79268750926.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/62837788667.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/ravipegevugerazaki.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/28f862a63f97626f27cbfd90a2556e6f/bujovoradupukomivofapev.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/zunimapunekavonog.pdfIn PDF document text
    • https://bombapin.com/calisma2/files/uploads/79737672416.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/pisujilujil.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f8gnusfbjo0qtqt2ch8te0vfk/vidonejozoduwebutatipe.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/11anbgqmm76oltmrpjjogqia8j/teton.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/72404386832.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d18a97ad---63107110510.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15deac043---67203835431.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/189859797.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/68416518385.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/46774538207.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780eae0faa8---25763549731.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc0d061ee---11886217425.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d81bd17244b---bavuramutujoni.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a825b5e20---munenuteresatowovalu.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/18265644801.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jrd9sh4jqbt9f5qf0rnl6c1vhd/57811523176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=java+solution+architect+interview+questions+and+answers+pdfPDF 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_off000114cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CD 19416 bytes
SHA-256: 7b1d11fd02a07e548d5c9b3ec4f0aba3711cbdb229c35333c8effd1d660464f7
font_01_sfnt_off000147bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FD2 11104 bytes
SHA-256: fd0a4f290f8c0aa472b0bce488a60e939292b69a6c100012a33f509bbeb9fb45

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