Malicious PDF — malware analysis report

Static analysis result for SHA-256 a750c8c7ecf282c3…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 09:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00a5a79598343ee1e0fc677a3bc26ba8 SHA-1: f60cf88e08905899c299d6149c5c469cb0e94927 SHA-256: a750c8c7ecf282c3ad7e1b5c55f6caf55aeb5b46e2cc23fc96266442f715ad73
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary lure appears to be a "ring security system owner's manual", aiming to trick users into visiting these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://garglob.ru/uplcv?utm_term=ring+security+system+owner%27s+manual PDF link annotation
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/vuzasagima.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/vuxategemise.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/39769031286.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/293314ae46ded9ec0d8fbd9b15a4c718/munigowaporow.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4c7e1a2af---fafuturevedosebimi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d3e37d27ddd5ccb80b07386c929712ed/pixal.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/26694029149.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/6765e800718e5f0f66933a4307073a84/70388938799.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/15977039278.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/tagur.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/barowixotirirorizorira.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/66246512ef465a575f9539282b48257e/wopejeribufumogo.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/xugapejeraged.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/14502914697.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607992ada9749---botubuve.pdfIn PDF document text
    • https://5uempat.com/contents//files/fufiv.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/904b9fba6d14dd94eeddb8cd270c9379/juwozijogovukegab.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/wipusabajizekosewurejer.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cec554865e---87613819116.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zijepixiga.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/sgl3dej47iiokghrogigjiukd0/vetagosuvi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1648d02d86---89015280146.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_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 10952 bytes
SHA-256: 0ae520eaa4ec7570af4290cdea62c13f081809177273189a1d2f4e77a80be853
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 18468 bytes
SHA-256: 9d2bfb556175b362fc85409f01cd2a799c4a52c87fa66ff10c9ec5d5d1fb6fe8
font_02_sfnt_off00013b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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