Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e4772b36d4dabd…

MALICIOUS

PDF

145.8 KB Created: 2021-09-01 18:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4f5cc89109ea424cf784db5addbfd686 SHA-1: a11afe1b321c121f8d1f7705c9d2f5e1b0091714 SHA-256: 38e4772b36d4dabd9e0531302e1003838b6332cbc555a3b68e0cbab73b0efb11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://coretry.ru/uplcv?utm_term=wiley+solution+manuals PDF link annotation
    • http://yournamebadges.com/withyourdog/cms_uploads/file/37172937467.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/15685943801.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/kugogi.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/11310110479.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f01c5d6c7b---7116996689.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1c04a0960b8da4e170aa0172b8a449ca/73596902799.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608645537f89e---toxegalagegenepolux.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/787562ed214f1f386ea3daf54b51bb74/disokesaketin.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/35674823866.pdfIn PDF document text
    • http://ecologie-energie.com/userfiles/file/samut.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/teberebuwanut.pdfIn PDF document text
    • http://packamate.com/userfiles/7223713113.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/52893274771.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l5pds3lvdsb5e9c12uhsk5t30l/42577163395.pdfIn PDF document text
    • https://jobtiara.com/files/files/vavagiziwanuka.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/59683140475.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fd2da8efbef2a67664244a98f80ef45d/80375755094.pdfIn PDF document text
    • https://mauspro.net/upload/files/22669671980.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/98c5809abd4d2cfcadde7ea1bcdbaa95/bikuxopumivarofiwagojod.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/53547854790.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ea55962a4aad0d1d1a0ba78519879878/12722011594.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf1541283d---vobalovezow.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/36063443325.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_off0001d263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D263 10376 bytes
SHA-256: 326d4e9f4797170f2d55f716c89c63a1cad709259d376fcfff890b77c56fc144
font_01_sfnt_off0001e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9E0 21208 bytes
SHA-256: 5f98aa775f3f5e925d6a167b81dd5d232cecd9a2b5216ef4419e8e31ba463b0e
font_02_sfnt_off0002219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2219C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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