Malicious PDF — malware analysis report

Static analysis result for SHA-256 649bc17f6367f59d…

MALICIOUS

PDF

86.4 KB Created: 2021-07-31 22:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 470960d32c8d1887ef271623735db66b SHA-1: ab52e8c941980b4f39f86e85fd37e665663d3ce1 SHA-256: 649bc17f6367f59d8486d7e465f012ef272a65a6227a5cff0dd37f1bed0d76c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing and trojan threat. It functions as a link farm, directing users to various compromised WordPress sites and other domains, likely to download a secondary payload. The embedded URLs suggest a lure related to downloading drivers, a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=download+bluetooth+driver+for+lenovo+thinkpad+t430+windows+10 PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a1a5cd84---dukerevobisugikolo.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/3615059170.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/kipugesef.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8becd35e8b---giwejotexakoverali.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/2cd3cba36304ee66d3269709e6c9e5e9/tigiwajegubo.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/86242867465.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/baginik.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624041040.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/39545280659.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d70726724---55016602044.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bfc110806---mirufezoderuboziki.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/20006139877.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e7c6df73---wotafixufam.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/73648572380.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/pakijepubolifunimalo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6e16941e---jimifitofarana.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/kafokenigumetuzo.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/91045950673.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/da4fe65fce5ca222763687d0b07972bf/88412143097.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5984927853.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7a9a3c6acbe9b10126d0d922df0b287d/72844995556.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/55227729915.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_off0000e732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 17680 bytes
SHA-256: a98b90b007092d42ecb2102051596f49fd249e81795ee9569980f7213b6b8708
font_02_sfnt_off00012dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC9 11504 bytes
SHA-256: 8d34a00e94830df5d2c6518bb082e2db9b3ab12ddd56f523061a393decc23ca1

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