Malicious PDF — malware analysis report

Static analysis result for SHA-256 79fd6b4675b46716…

MALICIOUS

PDF

87.2 KB Created: 2021-07-03 00:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c471703baa9828605776c54c87d024f5 SHA-1: 197cc4a0016fcfcb602d7b757dd98fbb18a5b571 SHA-256: 79fd6b4675b467165331f3fef193d22fffe37b570b7bcc1b781db98b4ad545ff
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The presence of these links suggests the PDF is used to distribute malicious content or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab6e6c7255---pasokibujusixuburage.pdf In PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/i5qagu9bdcbqg0oqh9qf8u7vj9/kurewizugu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c163ef02ef0---fiwiverimavovavalewosez.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/88990834715.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/47104892026.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/78360061369.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/3a0g9tcqd7sbe3ms7f88h4pgnc/99932427031.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160805c1d803e5---pogaboluzizafolemagafu.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rokagaboke.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/danafulepupepepup.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f817c9adc7---fikaborufotowagi.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/11745583840.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ilo8v0hiio2agdq10eq7b6r3bp/vozonijexo.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/zibipagejekin.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608278a2c8a66---dinegemi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1dfa5e14---wumasuleral.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40c8986f4---sexolusiduranagamudamisit.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0b8d9eddc83ff7235f3225b663fb742f/bavarefuwubilaved.pdfIn PDF document text
    • https://morabia.fi/images/file/dorovemafunemikamasidu.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/kamabawujediku.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/miramusuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=in+another+world+with+my+smartphone+tv+showPDF 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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 16704 bytes
SHA-256: e2627034133db3dc1e20094a97cb8137fadf59680f068f2dceed48b2cf936d5c
font_01_sfnt_off00011e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E43 10872 bytes
SHA-256: 4e39d059c82b36ee668ca6f40a2b374df7f947ad29878e65c20e126a018d197f
font_02_sfnt_off0001373d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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