Malicious PDF — malware analysis report

Static analysis result for SHA-256 4666261501be12a2…

MALICIOUS

PDF

74.2 KB Created: 2021-07-01 11:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 157470b26bde4f89cf25985fffad4765 SHA-1: 24e1b0feb9d06b62d05a6988a53404a978d4ebc2 SHA-256: 4666261501be12a2250dbdbd9601f0c9c07958f6dfdbd1196b4af0b164649b74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=readings+and+case+studies+activity+answers+sociology PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2febe229e3b36f051da78067e153fdd0/jesiverovoradipidetesepo.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/3861206168.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/64765624382.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/98879378269.pdfIn PDF document text
    • https://airshow-bg.com/file/vegifiset.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4bc4dsr0nl2bc9424150ehektb/64065139296.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/30bd5db74f87a6be88530e0a2ea7b688/49115067378.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/pepofesexesemudesowijo.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a53d1519a3794a30f50f71ff6c7e0286/19543750919.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/24fc8ca188a58f96bc1ec8bb523c5b00/lagufibajepixivawixa.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e00dc9377e542c0ac28b229b9cb56645/kimexow.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b4638d3149d2db6c116dcdc7cc3686d5/15014489836.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/xedutuw.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/lanozedivijeludono.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/puparazelulela.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/25010474354.pdfIn PDF document text
    • https://blogsma.com/files/76510574456.pdfIn PDF document text
    • http://tcihk.com/userfiles/89405037745.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210530_C01FBB5E0FDD65A9.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/17624963475.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/40647425222.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/59153541890.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cphhh7b9u07bh1pihaalrpme07/15360939250.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nurifaputojejufu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF2 10956 bytes
SHA-256: 017a4433ec9137d442269096b0b3d46502a8760664e8d6f322f8eb33fe13d310
font_01_sfnt_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 16524 bytes
SHA-256: 6acf3acd00d5e5396d34177e09959ab15e8ab2654f7a205ec105b8dc9701ef90
font_02_sfnt_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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