Malicious PDF — malware analysis report

Static analysis result for SHA-256 e161aec78273756b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 20:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6adf27e5b0ca236617fd5b82a2649471 SHA-1: 428c4555aa2e8937999740220b1d7d8e1253c460 SHA-256: e161aec78273756b67fd8a61d455930a530b465772bb038b8753a969ed9621dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9333

Heuristics 5

  • 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
  • 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://maribon.net/app/webroot/files/userfiles/files/xarewifusetilu.pdf In PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/80774039565.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/29472125497.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b29020a7---jamoguzovoronani.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/konimovonofimalimolewikom.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/2215023156.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108112100403861.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210720140328.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf81ecf647---xigerinazaxikulazelozatud.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093e1164597d---tawafefawavebukuzix.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6aa0654e8d8ce83b8eef2f98dfe9eefe/39010202305.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/58695451509.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/kojefiwiripevi.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/39738979049.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3l4t1fiucbkkl3g6o0ee7prd5p/70357629486.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/fidadapuribupunafu.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/b7ef3ed636691b3ddccb185ff2946ddf/beniw.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/pajedafunivulej.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/fh5blk4e32c7l9rh1e1lurvt2k/xumibi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071edf44bccf---fazoluxidenerivorap.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/34054993958.pdfIn PDF document text
    • https://ebooksweb.net/files/file/83864824744.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/logajelivosukalixix.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/pk7oi1ln1am60ade9o7g2gktgr/lokitubunifaguwifutam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=14+types+of+dwarfismPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12958 20276 bytes
SHA-256: 182fdfbb3d66d20f0f468436f2e22e4b93a888273cee95f159e22bbe288bca63

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