Malicious PDF — malware analysis report

Static analysis result for SHA-256 1337739d0ccaaaed…

MALICIOUS

PDF

70.6 KB Created: 2021-10-09 16:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08bef9e170ab32fa23bf77f5e01b2e1d SHA-1: bf6beaf4250844c1b74047e0e9bd9d2f65451616 SHA-256: 1337739d0ccaaaed43e19102b9f9bc5166fb470783bf3fc9b32c295cb62b4483
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript (T1059.007) suggests it may be used to further obfuscate or redirect the user to malicious sites, aligning with a spearphishing attachment (T1566.001) delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=wordly+wise+3000+book+8+lesson+6 PDF link annotation
    • https://bravo-hk.com/userfiles/file/segefuweg.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/13398265542.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/32462527470.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/72937063548.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/48752741864.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/21142735936136ca7c12592.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/finigimenokotezujizudinun.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/45985239896.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/nizeparodoziloz.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b394bc1831---nunisepawubefajegedip.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/96499961719.pdfIn PDF document text
    • http://apicn.net/upload/files/dakesu.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/5582510045.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/bee867fac9b48b1876256b2326e48d32/61418582047.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161520dc4a89b2---ravuxizavujutodefe.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/linakoviluduwupos.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/jetabomurozologexuj.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/93677444295.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/pagexebasedopewi.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/39282689061.pdfIn PDF document text
    • https://cargotavio.ru/files/file/dipul.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/46661907042.pdfIn PDF document text
    • https://comlosumare.ro/userfiles/file/foperegirumukukop.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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 11076 bytes
SHA-256: 357caffa821a19f9b529a96d9eceb8bd6f212d9d1b30ffed989537a7d13f4b8f
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 15880 bytes
SHA-256: a313db9a9405705d44bcf6973cf5e58bcbfd767c54a4f56c3c53b318a342f56e
font_02_sfnt_off0000f522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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