Malicious PDF — malware analysis report

Static analysis result for SHA-256 5178621b2cf24124…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 08:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 573d87ce168ddd35445c666bc2c06db3 SHA-1: f3829d886da2026c138890886484c7205ef06145 SHA-256: 5178621b2cf24124e1ea454706fcb69f483e79c7a6162d697e38b621f114ba1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krr-nfe.com/suratnfe/UserFiles/File/moduwelazezezot.pdf In PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/lofexopajovanor.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109100400235627.pdfIn PDF document text
    • https://firsathosting.com/calisma2/files/uploads/56251390924.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/givelisoboxamifepirisines.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210912124628.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/puwunalobananuvimolasudex.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/75429422328.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1632574360.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615446d195d8c---vozuzimewitezowokika.pdfIn PDF document text
    • http://greensketch.in/userfiles/file/55298202359.pdfIn PDF document text
    • http://fitviewer.de/files/file/dupajola.pdfIn PDF document text
    • https://fishuntpesca.it/file/tasabivofiririronujasela.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8a001faea---11597919574.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nipufotafizavipo.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/35553279505.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/putes.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146d4dc9d396---42676346927.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xadelagemumugim.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd0a49c1b---kexenabudotovozilevuxes.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ca998770ad801977e4d801744a5d45a2/53602407254.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/vamuxidigelutafuto.pdfIn PDF document text
    • https://kimcert.org/E/file/3628389058.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/28957844223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=hbo+max+a+quiet+place+part+2PDF 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_off0000b077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB077 16528 bytes
SHA-256: ad20e690bb045c96975521edd13a331a5ff18c405fedc4fa23f86999a2a79043
font_01_sfnt_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 10864 bytes
SHA-256: d60dc3280f86737a094e4e238fcb59202ab7daacdbc11267fcde7b5f7ed466d4
font_02_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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