Malicious PDF — malware analysis report

Static analysis result for SHA-256 9667ea4b58526b5c…

MALICIOUS

PDF

94.8 KB Created: 2021-09-16 12:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b01889615b0a0bd631cdc0dd79a3ac09 SHA-1: 8e26c32af93486dcfef67fd455a0c9efd1bea5d5 SHA-256: 9667ea4b58526b5c09f13680d1cf4481ce2864a965a53aee362e180d1b3d640c
156 Risk Score

Malware Insights

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

This PDF file contains a link farm pointing to multiple websites, some of which are hosted on compromised CMS platforms. The ML classifier and ClamAV both strongly indicate malicious intent, specifically classifying it as a phishing trojan. The document body is unreadable, but the heuristics and URLs suggest a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • 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.
  • 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://solener.info/ckfinder/userfiles/files/vefotase.pdf In PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/kenalekogeneg.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/gareruwojugirelegub.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/kusuvukaregevosizomabix.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/xujofakuteri.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393971c634e---balulusafu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/69ba5147f78ebf9640af96282efc4cc2/piwamadewiwemivuxosuse.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613951a15f50f---3656902667.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/xofiwu.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/zukewosapagez.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/95058321676.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/rltelaed69cvrbnpjf31gto3cq/87847464718.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/92574142563.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/bugaxejodufilozuxilenesi.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/vixutorebur.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eda4c17dc---9931459340.pdfIn PDF document text
    • http://chpcentre.com/files/file/58131515452.pdfIn PDF document text
    • http://jfe.hk/userfiles/newelurulukumaruwefori.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/83nulpip9hugucacuu44kt9ooc/menofe.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/madefiripolebezuxego.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/83057949484.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/41376840042.pdfIn PDF document text
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/vevofofafolebujaboz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+best+off+road+game+for+androidPDF 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_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 10856 bytes
SHA-256: d153b59e642c7a6d9b9fa96e83d897ad9d7dd1ed1162f7e371b78aba2bc3719a
font_01_sfnt_off000126e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E8 17776 bytes
SHA-256: 51a06885a032ff7ace1e6609eb2dec50b83dde23a767e488c456cebeaf5e3885
font_02_sfnt_off0001553e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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