Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d62e5fbf1839f52…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 22:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e3bb2db01c81a1002fb169124b2ecae SHA-1: 9cc043cd6040e0550a5c45828fc5e383d8bad5f7 SHA-256: 5d62e5fbf1839f522308c54666db2ac329ef00b0a2e56d19eca857f6617e8167
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these are likely part of a link farm designed to redirect users, potentially for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://krisoc.ru/uplcv?utm_term=mcculloch+steam+cleaner+mc1375+manual PDF link annotation
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/07a59ebb1ca3ee088657a8f874817102/23844539380.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/ab49c6197079509ff46e2534c5623c29/kezilitosamexabumox.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/b12edcc4f6c759c02933152933f48789/pumov.pdfIn PDF document text
    • https://bfull.ru/uploads/files/zelulime.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/4b9uv7er6fnn6ds77i8clrt9ej/41573104312.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/tukelexus.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/43835915618.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sutuwupavusojivagir.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e0a80bd99ced0312f157e444e55bab4c/39325906182.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/41821375746.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/t34l9c8a4na24b5glm08hnpiv5/96055737298.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65c47ad5b1---22120914572.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca815aac5b---94513464345.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/wilixobelavunaxisipeji.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/44760912873.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608567b94e3bc---zesosasufetinimar.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/788910a74c637c64d480a250fde87712/34740825957.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/zexisuwewit.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/163e76a5c71cada782a105e5cf56eb97/46301047523.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/rutanivawu.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/goworebiwosim.pdfIn PDF document text
    • 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_off0000d980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD980 17068 bytes
SHA-256: e7ade8bd75f52ee280b1cf7e6f5da68979acd1d76cc2f75dc049fa1feeaea93a
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 10904 bytes
SHA-256: f61319794beb212ec9e72274b5c3827c37c4751fb2b5ca228acbb74ee8b520a0
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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