Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc729188192a276…

MALICIOUS

PDF

93.3 KB Created: 2021-09-20 06:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce16852bcbf60519e6c8a45d9329e99d SHA-1: 5d7fd49377ccee23d93f2ed82aa189717971c91a SHA-256: 1cc729188192a276be290a853991966ad7113d1cd47cc04c3cab6152f928f7b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting it's used to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=loki+episode+1+123movies PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161385ce54337e---nirap.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e17c1c914c---90895358404.pdfIn PDF document text
    • http://landpas.pl/upload/file/85910021393.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/50605820415.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/novibisopukalojafo.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/tobewevelifenijigefevewef.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/mulanow.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210919180100.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd6d552336---rupikesanimulamatibadexu.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/fogume.pdfIn PDF document text
    • https://olivermilk.vn/tctt/sites/aaa/file/4994634778.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/vubitediboxurulelegumen.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202199119105949.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pafufujedorewatepanum.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/62687740339.pdfIn PDF document text
    • http://xueyuan.zlyxgw.com/uploads/ckeditor/files/20210916021715.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146d67256742---wogavabovetidakiparoleta.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/garikepivibop.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/julezuxi.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/96809384441.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161447384b6d06---nagerifipoberitor.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/81361528282.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_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6D 19852 bytes
SHA-256: f1bce82b6dc1897d0aae5fe5bc5a39567a09b1e65aa1b1aa636446b4f3ae3a61
font_02_sfnt_off00014fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC6 10500 bytes
SHA-256: 40e954a79191c8ebdb08acf5474b86c1da2a4d3725b287a0e812eab1c03e2b0b