Malicious PDF — malware analysis report

Static analysis result for SHA-256 b135962171a232bf…

MALICIOUS

PDF

90.0 KB Created: 2021-09-17 21:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b81754a96581156cc0aee87523ee63e SHA-1: f98d20fb97703ff4c212709269560263d28c9fd1 SHA-256: b135962171a232bf363fe5b3b325e27c361b071ee896c56a9e0069c8684ab42d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm with numerous URLs pointing to potentially compromised CMS uploads and disposable hosting, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://clinicscrm.com/img/files/lamimelotajubuz.pdf In PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/ropanaporidufakobutod.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/gunarilujagol.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/71896073660.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/61825566876.pdfIn PDF document text
    • http://wernitznigg.at/files/46428855468.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/36651427208.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/67183980497.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/koguzasutu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/d55eglkim5d9hlj3sk92oc8rp1/88698393447.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/b8db5e442d00e4afb7652f0e8199418b/66364715502.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/68260565777.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca7aa913d---duworusurubug.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/febitikodabowedulivisoxa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b73e05052a6f4fb016d89d04d10fd8bf/girofufubafo.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16133d59f09c53---nuroxediv.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/k2606rrg0ubtkg531m403kehu5/65177957602.pdfIn PDF document text
    • http://rabwork.com/media/file/71931625855.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/kiwup.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/robijolonamalepojabufem.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/26728054903.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/64685830031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=brs+anatomy+9th+edition+pdfPDF 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_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 17712 bytes
SHA-256: 3cd9273fa0300596c2d8eca65d19a235559afd95aaa5320cc3468bf4fb7ec10e
font_01_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14095 11052 bytes
SHA-256: 4308c79f6ded3018d8d27072ecc696a75a5dfb61309796a46cdc3cb2b8add26a

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