Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf5fe5193dc497d…

MALICIOUS

PDF

85.1 KB Created: 2021-07-08 08:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 9a75d4ec9b17e77cd65eb5ef3729a693 SHA-1: cd831766d59843ca2dd9c2f3a299ca4622eb3043 SHA-256: cdf5fe5193dc497d52fa260f221f3358759dd98abf0aaa412835eeba98f49b43
156 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

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 https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/22cfed088d162d56b0d7e3c17952e562/domezipemovosaf.pdf In PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0bd5fdb705---dupixusemumexoxudilofalop.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/33916048879.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/67648053145.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6811ae801edf89f7bb69e5fb794abdb0/16316388854.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/79483271553.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/tafutaved.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607354f420372---24615754273.pdfIn PDF document text
    • http://megalaserasia.com/upload///punanusuwukigelebi.pdfIn PDF document text
    • http://svx.su/ffile/file/latitixudevuzag.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160964f1bc951d---podapen.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/97930848719.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/193f0492e58a6aff3161fc5609824a39/nitama.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/forowokajufewikitimig.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/felekuxubugifajopuk.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/perezevojunujoliwesare.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/sspu9d9v2vkq3ckqv9j06dd6h8/buzoseruzijem.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a2853677---3932449031.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/90571784826.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdcf2fedd3e---78561945316.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4587ad0fc3---64422086308.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a75fb97f12efbaabe7207511c7ad4574/tobudazuxori.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/4245241798.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd2cba10f---pivomu.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/41588911013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apologies+for+the+delay+in+paymentPDF 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_off0000ead2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD2 16472 bytes
SHA-256: 54dd2fffc518645d4909b45a0934b6808ecba1f45c29163ed96476b3ff4e3239
font_01_sfnt_off0001158e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 11040 bytes
SHA-256: 5ad9dee444d4f5a15af6638fea11f89fd06aadda3183f521918a6e9e55a205ff