Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eec77f60619505d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 10:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 08091ca868126fa33d4ce9f2958fc0e2 SHA-1: f21f0d1f44a6612ef02516ded4065b23bdf041a1 SHA-256: 5eec77f60619505d87097aa5225498256a052ef500338da01d6a419e134230e7
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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
  • 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://synerhu.ru/uplcv?utm_term=how+to+scan+qr+with+phone PDF link annotation
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/dexanowapemexurevi.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/3112661648.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/72872621554.pdfIn PDF document text
    • http://dongphat.net/upload/files/gajejebukitudolilibet.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/16429032241.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/89019667434.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/woxuvug.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/wikuwoberifiga.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/dizolodogava.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16142c44721cbf---zasugotebeveri.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109031251227573.pdfIn PDF document text
    • https://menu2uplus.com/images/file/23142785842.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163135336849.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pefekiwopov.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/26854083549.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614061b4d2dfd---71218570882.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/8b7328134b21edd32e695369931b09fc/3461717050.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/rirakiradodifepavir.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/3696b2d7e534b636378399ba50c1f111/dizipifasosegagaxefajatel.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/43030358338.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/55686530260.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/vobulesosozovopu.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/fabulakofuz.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_off0000d4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C4 10648 bytes
SHA-256: ffd8b6274942b3d6595164a086429ad9be2a76525c4a9af64789f4d57a5988d0
font_01_sfnt_off0000ed23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED23 18360 bytes
SHA-256: 164a02edd563b89955269e16afcf44be600bd9566269d94976fab6e67d8cc1a6
font_02_sfnt_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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