Malicious PDF — malware analysis report

Static analysis result for SHA-256 320b97ffb10b28b2…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 04:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1ede14a88be2daf80d041bf50bf9cbb4 SHA-1: bb1af75c9faefecee6d6829918277eb851faed8e SHA-256: 320b97ffb10b28b22928901a0d484bacdb3c46f984b804accd4e2f657e7261b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The primary function seems to be redirecting users to phishing or malicious content, as suggested by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crewmak.ru/uplcv?utm_term=destinies+of+the+soul+dr+ludovic+pdf PDF link annotation
    • https://nutricount.cz/UserFiles/File/ruwititarujesekenufudewin.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/44049155950.pdfIn PDF document text
    • http://afslab.asia/upload/files/nidodoretavoduvotazoweji.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/sujugidufofedebatezewuwu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/80714760433.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f238218c999---82955677672.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/vetutiwasutupasow.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/zisabobedaduxevolezizipu.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/55696035010.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/82079355873.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/3153731807.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609278ad96a8d---11093358249.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/1c5a4aae3f5cb4a04dea92bd089eb40b/lonenosidal.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27eb40b8f---texojejowavigibitarure.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3f8066cd425f8576e474709f95028d6e/bubuxoverijis.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/17287185967.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/vngqvasaj0skb7sdrmfdp71uic/wosejatejirupifu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160865ef78ad46---58669654765.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/78159568468.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/89853891938.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c204322d6---japobuv.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f436f1aaa---96612538528.pdfIn PDF document text
    • http://climtech.com/files/files/wokopisi.pdfIn PDF document text
    • https://hojoairport.com/images/file/57605091746.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/nakanufodokukavumuz.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/22424499537.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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 10724 bytes
SHA-256: 89c223d2b0cd60bc2be30665e7e053ac4777efdb0e61d8909ab216e86bb6f580
font_02_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 17708 bytes
SHA-256: 372c68d4289f90021098151c7de783fb07cabe64c696d1536500c4bd53590501

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