Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba5d2e9bdc1c38d…

MALICIOUS

PDF

86.2 KB Created: 2021-06-26 05:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e09736b3371fa90e1e0630658cf21b57 SHA-1: 8082d0301baad35ea5abb2f2006ee19c78c8a3c6 SHA-256: fba5d2e9bdc1c38d6fdf06566aab147e5e3bc19f8af4acf7fc15967467a0b1f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ketchas.ru/uplcv?utm_term=cooking+with+lump+charcoal PDF link annotation
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/h8vs9cpmrgf2qui6l1jhd588gd/lupitamesunanobisusorive.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xerefirisufun.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086887035559---konupe.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/47885719908.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69dcd2d7d---40090164710.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/72047134619.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/62435295201.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/6248c6f683474279226a8db5ae81433e/70078909984.pdfIn PDF document text
    • https://carlojans.com/cms/file/28096918840.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/14116363837.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c636e677ccb62886c086397c853cbfdd/wufovowodimex.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d473f7d942f7600afa017b6802df7401/33094489222.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/92227f43270f0207bd5dfffe27d6be52/nizeropokabazisoj.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/67d032b36f64306505c7174149f4141b/89133181610.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711a867319d---9716398230.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wusivapefulatazunusoxot.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/ravoxepedun.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/65268339339.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/90e5be503ed5bfc53e7eeed83ca75e71/11041459848.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/lokife.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/nogaxuxesenirur.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/98132892672.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_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10832 bytes
SHA-256: 44dd6cda7c6cfdcd4cd74149133fc3c4c7599881773546abe3044f5050dcf281
font_02_sfnt_off00011e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E04 16920 bytes
SHA-256: c08c539e6f2f089ba12b47972827ee5dec106588741b91a6d4c5084c81f69656

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