Malicious PDF — malware analysis report

Static analysis result for SHA-256 f038c693e4bef143…

MALICIOUS

PDF

103.4 KB Created: 2021-09-05 17:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c996468e19080da8f41f1b92e785319d SHA-1: f69ae62e95bdc48523a099048a5adb5c8ccf9dd2 SHA-256: f038c693e4bef1436dc18d8a924aed082fb9839b0bf7e96c814cfcb4b147b239
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm for phishing or malware distribution. The presence of heuristics indicating a fake invoice/payment lure and password-protected archive instructions further supports a malicious intent. The ML classifier and ClamAV detection strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/82955702860a90029028e3.pdf In PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41bcd7ca8---69375784889.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/90203154478.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/22b9bca2c3048f2d0ea5a3612dc050cd/vemotu.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/74208518703.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/pavuz.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/wigudurexedozazunoti.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/97278777622.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78cb5aa60---famakupapibuwob.pdfIn PDF document text
    • https://primer-spb.ru/files/files/35603067264.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/27978010699.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/87325243247.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/20356342763.pdfIn PDF document text
    • https://basisangka.com/contents//files/gamugov.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607778104617b---61285606496.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/wamutikefaf.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f660dc00cb---31709364666.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/11203306726.pdfIn PDF document text
    • http://alcantara.cz/data/file/lifuf.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/a512qra383elpl276o0nrub5ru/lepuwutoweraxedimanikipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=picadora+de+carne+manual+rosarioPDF 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_off00012a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14230 10532 bytes
SHA-256: 622be214b5cbc43ee68f42d5c730b8d5ec22c09b09ea9ac9ec87001ac090840c
font_02_sfnt_off00015a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A1D 20544 bytes
SHA-256: a82485d8b77aa41a56a9f698e1a6cb91f275d00320bb6c823de71c6297c87bbf

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