Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02f8e986bbd4fa8…

MALICIOUS

PDF

73.5 KB Created: 2021-07-13 04:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1beb69f3de768f23383fda2dff764c96 SHA-1: f4631609a0170f48ed394be528652f93e256154f SHA-256: c02f8e986bbd4fa8458c3abc74d0e41f7c5fab1a1027e6dd9959227e7a9abb82
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, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other potentially compromised sites, suggesting a phishing or exploit delivery scheme. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed621af3dd---32776820784.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/42161088879.pdfIn PDF document text
    • http://industrialdevices.in/uploads/fekodapekixex.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/lovajakozu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/2564746fe1f7a7dc48dfefa7f2ce86a6/ziterobed.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7528b13a7---12418875046.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874b6b454a3---10800770985.pdfIn PDF document text
    • https://dcimx.com/files/24311885323.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a935a139a---62307522707.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de03f1c8759---80657586304.pdfIn PDF document text
    • https://taperagi.com/contents//files/walexubikuvupatezo.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/1711563381.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/3362088118.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbddc4c95f---wobinubideg.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a01c87eb3---66720067931.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/34471956884.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52e2578ef---54644282490.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/mumuvezax.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9bdb84a406e97fd8a2bc685b4d5d110c/dugeridutuketuriwuvedup.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76462a2734---91576896882.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25bf60bdfc---turadotubojibakosilul.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/01501b72a69dd112e2fe9853e1f9ec84/45497562539.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3bf29b28d83793128bbb21179712a697/55550210819.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/vexolupipunalogus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=object+to+arrayPDF 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_off0000bdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAC 16900 bytes
SHA-256: 79ecd8fee503618f50e48f2b3e29643edb844f3fe276e085852fd260de7ff610
font_01_sfnt_off0000e9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 10224 bytes
SHA-256: 15feb42c334c41b0aa71ce39cd257e11347e7bf62c13dc26ff5202947611af03

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