Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1276929db73bffd…

MALICIOUS

PDF

74.2 KB Created: 2021-09-10 14:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 417fcea15bbf5252f72c6d5be9e7671a SHA-1: d08ffce1e3b62b5d729be42fc23c544347e04f19 SHA-256: c1276929db73bffd4c067462255a58960c91024037ba47de9c49ba1ac263e518
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging PDF vulnerabilities or social engineering to redirect users.

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://oniceh.ru/uplcv?utm_term=adobe+premiere+rush+apk+full+version+android PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3eb6823fa---43326877501.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613255592b2cc---93331658981.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/19188031929.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/19437592584.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/22122787915.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/41232399275.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/46254782611.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/48834556970.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/89150054273.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/tumewizaba.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c18904ab8---77494039180.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/3261361654.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/37849171263.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/vuvuzinelimafokifax.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/91729716668.pdfIn PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/2921938925.pdfIn PDF document text
    • http://securitydm.com/slicice/file/kegefotifaguzi.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/57673601582.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/xokixosawij.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7e96b8a4---jamafalifuzawetexire.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/14881635912.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/52104397829.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/kakum.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/21848665770.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_off0000c093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC093 11044 bytes
SHA-256: 0354eb2ef9ce84792260d17837791c656204f2933c2ab01df93eab0c3eab4026
font_01_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 16276 bytes
SHA-256: 3e9b363d329ddb5e05ba45f890b6da5ad47cf5b7298efce6420c107e6b0515a4

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