Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3db4916a8ab82b…

MALICIOUS

PDF

153.5 KB Created: 2021-07-31 12:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2f4a4d93a15b718c19596fb6c6175a5c SHA-1: b4830231b5d86f89cbd74b18b85b9ea7b9e568a7 SHA-256: fb3db4916a8ab82bf6f26376383106f7cb75259f21839fff52506cf21d8d5070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm designed to obscure the true destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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
  • 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 http://adamlegal.com/userfiles/file/zupixobetavanunivawivud.pdf In PDF document text
    • http://minerva-collection.net/files/files/20695379311.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/nedez.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/30569648648.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160791227421de---47263954817.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080decdb7dba.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/20424491964.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/tekajuxewexegabekuv.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/xenavepobozilor.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160834e73dc261---xomijiloz.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/sugipamadamez.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c92f9ab193---nafezeganazeseputenopo.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/duvebopupopoxudufisamoxo.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/janusozole.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/16116484211.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/puzezuzisufijaginulijoze.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607860451fd53---mupolerisor.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/78289024329.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae0fd6d16c---fulejunariluralubiwuti.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/63747137804.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f7bd0f47a838141128a71b24af80fc70/28777912679.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/17505402032.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/2291909766.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+buy+geek+squad+job+reviewPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a915b8d0f39---36582030753.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_off0001f262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F262 18784 bytes
SHA-256: 7f4b50108c7841da862d802300b15068625350022785bde1341b7dfa5338e7c8
font_01_sfnt_off0002239b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2239B 11200 bytes
SHA-256: 09838dc41dbafcad59fbdbbeefdc5074bf1872d409f20c1e0584773e3c425d11
font_02_sfnt_off00023d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1