Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0681ab3fb5b0a1…

MALICIOUS

PDF

91.5 KB Created: 2021-09-05 19:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec7799f94b7e2af747d57fa93567ece3 SHA-1: 97057ce94bc4e7d4426f4ea0c04d477ecd23931e SHA-256: ad0681ab3fb5b0a15f81f00d77ed50aadf6d2e8b4281fbe4b3c89e3d0e787fd3
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an intent to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to improve search engine ranking for malicious content.

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 http://planbmedia.hufiles/gemosifujemogudipem.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/u6e75rlmmrs3rg6vag21olcjsd/vamipadenorurejitasamoxit.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160989f0a8e39b---vewusogagiwevavanu.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/20677980613.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/41362002426.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e16b07c43526eae348aa17dcb22dc812/82193231916.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/2107242151493184649fi504j36zdr.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/971c3d8aeb18f36de3c8071a59303bfe/soxadom.pdfIn PDF document text
    • http://mcelvain2020reunion.com/clients/b/b5/b5167212b805812c9439186484f80f5e/File/54622354094.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28270d278---29459782190.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609609cfcf554---10190724665.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lonmvtiqqp62k63g531fokj86l/xiganefelopugorazoler.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae1824f49---80487345906.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/46a03e2798373fc2b9e86e51b9173dc6/dafivokebumi.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/65136871587.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/refavoguxila.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae34c017dc---68965970526.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/26965852521.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/ac76a7684dd9759da3596e05fe58d6a5/47271965382.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/9199062372.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/23bef61dcca7f9e0dcf31d9a9e89afb6/sejulajok.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/17102521797.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/95b41d6fa3f0b70f4606d9f75d4274a6/43286579633.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/80163556614.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=area+of+trapezium+worksheet+ks3PDF 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_off0000fe5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 17876 bytes
SHA-256: 9cf47adcbd99e4127bb0fe7241c9aa5ec80eecdb95f1ef0760bdb75e092eff22
font_01_sfnt_off00012ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E6 10964 bytes
SHA-256: fc123b44b1539ed3adf294e294fa7f322cd9e808e66176a3be1b138cfb681955

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