Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc657bec20b41569…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 18:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f5ee495ce2597a7c3347af6ff246ed7 SHA-1: 71764ff6d1cd55cdbcb74b813a3515f25991e3bf SHA-256: fc657bec20b41569670532990e756dfad6976a49a4ff276146afc2605f79dd98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=cast+feature+in+android PDF link annotation
    • http://abwjefferson.com/uploads/files/80858000655.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/dasomunilegoxajekajoxudod.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/23863552319.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/mikotodeg.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/73862087859.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/89629493163.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/hcctl6nb3cm75osq2q6emhuu70/90288051637.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e617581055---kowininujulu.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/posajukerorivedaleri.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4a270663---fikekibipupamabafexibopij.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/zefinopababasobonuzed.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/35991266157.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/39249197029.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/puzavalumevazo.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/fenuzusowaxomivarun.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/77315346957.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/21629570355.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/satunupowikinuruweb.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5e8bc84b7---wuralajepibaxibixikaseb.pdfIn PDF document text
    • http://sunway.me/uploads/file/111510197999.pdfIn PDF document text
    • https://12shio3.com/contents/files/32794691101.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/gufisunipetatuwe.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/a2420d3cd323adef3abd4229ca76dbc0/korafatagilovefi.pdfIn PDF document text
    • https://ismart99.net/upload/files/59487570503.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/22627547669.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_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 10432 bytes
SHA-256: ed89c6ef1c7f6aa54c124b0aaf7727eb6afa4a4bb7049cb730b8bb44f6aba7be
font_01_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 17288 bytes
SHA-256: 897b2c042059995eae3c77cbe63fcd83eb3dcac2fb6521b3474e895f393610f5
font_02_sfnt_off0000f6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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