Malicious PDF — malware analysis report

Static analysis result for SHA-256 105bff09fd7133c8…

MALICIOUS

PDF

74.4 KB Created: 2021-09-16 16:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 48cb0b0afffa9f11c22b23b7de6d4681 SHA-1: cd563900a98b7169e0e76aced30e19d6678d1500 SHA-256: 105bff09fd7133c83c3bd783bc38ae9293a6a9b2d9e38bb8d162e0ee0ca48583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f82b7772e0---bupatug.pdf In PDF document text
    • https://andrejc.si/files/file/2896805142.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/29234786257.pdfIn PDF document text
    • https://people11people.gr/uploads/File/tevesasoguxawowuviwuvu.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/livabutiwanin.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nuvezatipifa.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/sikuvetewejepabujixiro.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161405f7c0edf3---86671405038.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141905b261bc.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/24806900016.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/kosodosixowoletelozofuzeb.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/87998784665.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/77677176497.pdfIn PDF document text
    • http://lawngo.net/fckfiles/sawuzeloto.pdfIn PDF document text
    • https://ferropula.hr/files/17026501969.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa8bc46555---13573265284.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e5c4e47260057c7515c7b74e5e1abdba/14507018240.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/38056758478.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/musopuwaxego.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/bunukutaxo.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/gefigedetedodibuxudemo.pdfIn PDF document text
    • http://gitishahjahanpur.org/ckfinder/userfiles/files/xuxozib.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/66508084805.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/zuwumoma.pdfIn PDF document text
    • https://kiptep.ru/file/leketuwovedujivowaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=chrome+os+arm+downloadPDF 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_off0000bfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 10440 bytes
SHA-256: ea3a36ea5de90bd3215f067c18e4d85689550b2918d8eccf4a1abcf2f87f7c14
font_02_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 17248 bytes
SHA-256: d3b7bf330becf0e7fc1d102ada903359a108b4a24cbf5dee5ded781b5f0499dd

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