Malicious PDF — malware analysis report

Static analysis result for SHA-256 778e56d455ec6e24…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 00:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 53b5200e19e385674476a55dc6ac4942 SHA-1: 4f7ebf276bb2780a3a9bb2f629daa85ecdb852f5 SHA-256: 778e56d455ec6e24c9cea0352bcede17bc69bda60e2a244641283b9dede0bb43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://tavcam.com/upload/ckfinder/files/finevulefolubivemilufu.pdf In PDF document text
    • http://djk-winkel.de/images/uploads/file/kajatotinorido.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109180501595795.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/61552845585.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/44215068706.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109062036295751.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57835030807.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/14127159863.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161493e8e5f591---59388330054.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/51147936369.pdfIn PDF document text
    • https://ana-jsc.com/upload/files/rolerufokido.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/36444443840.pdfIn PDF document text
    • https://combrooncom.com/contents/files/xobupibo.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/kegesalolebolanoxiganu.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/b2eve7ga1l1jq20g851scmqjb5/netejegubemud.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/15324030249.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/megaregevezediwaxubofir.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/78887750042.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e390aad4dc---gituson.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/70770790589.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/jipodexepukikare.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/f8f4e546b97dcd3973abd2df29e4775d/95420007198.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2t336ofvqignku9j9au9755b27/wafinese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=google+drive+free+download+for+androidPDF 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_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 17264 bytes
SHA-256: b5016ae8fc185981bf45281dcceaaca06512a7536446f6537114762b008bd9d7
font_01_sfnt_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 10452 bytes
SHA-256: bd0c4aa95e3e0f0539d1623352bf5a922295c4400fd6abc4f3d6c25e1bce3a73

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