Malicious PDF — malware analysis report

Static analysis result for SHA-256 995dad3bcb9b29b8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-23 01:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ff0fb2427f5c42d8e368625a123df10a SHA-1: 94b6917f4ccea5b396dfefbec7278befc87ff739 SHA-256: 995dad3bcb9b29b88477d8e9420061b5fd516aa74ff3c1dad5c51fe51667af7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://vadihosting.com/calisma2/files/uploads/34031248739.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j5moe9j839f6sq1abuvkualpt3/pofazifozofagefemapotis.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/pilixipev.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5eb2bd0b---53580653587.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/64304322391.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062d31f6f8---30888388277.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/jejibikaxiwepeno.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/fanulogidudunolod.pdfIn PDF document text
    • http://hydrem.ru/images/file/puwuropirorizodazudekuku.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210921_DA2DC99F5FFF402C.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/87920314260.pdfIn PDF document text
    • http://ifap.it/images/file/lowigogiraveka.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/ad63c30c2a855be48ca3c25c6a2d2b70/6476341889.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/70663612631.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/bupekowadorujusopegijado.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/66394611740.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/bixofupijurelaxapewudaraj.pdfIn PDF document text
    • http://congluc.com/upload/files/mufugobivuparobawoxin.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161367f3b433ac---gagisedusupidizuvo.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/kowamap.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/wifogegolidizojim.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/4268627988.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/59751353395.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/jinoxevil.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/49947187014.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/14224053582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=old+videoder+appPDF 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_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 23264 bytes
SHA-256: 7794f1fc04ec04f9df18d9e6f079f1af1cf3b1aa4436411155ef68462f7c7a97
font_02_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 10108 bytes
SHA-256: 49f321e4771b04ba0c8cab3f7a201d80a4195797c13fba9a2ef52652f2a72f6f

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