Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb457fbd9e603cad…

MALICIOUS

PDF

87.1 KB Created: 2021-09-08 04:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dc1f77e5e4deed9843c0a26744d8dd8f SHA-1: e6ce717c30ac57ab18df95818c0be9ae8d00a3b9 SHA-256: eb457fbd9e603cad8a31d5d0a35afc92752bad11476550f8e1b5788424785f0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

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://fpole.ru/sadm_files/febuzumedobe.pdf In PDF document text
    • http://aviatechinform.ru/sadm_files/wapotidesipafeg.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/rivurat.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/30893983363.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3aaebac1b6faee672d07d2bdcd9ccbc9/44152586861.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210511234313771.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/95272176732.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/vetode.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/83927228382.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52f300d618---98029666990.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/41313241651.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/zesigavewupitexanafabevut.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1611e886ddf7cf---77664778104.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612aa78abb745---43755261765.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uq92is5bn51s81p9551m7i3j04/lipasaratefixana.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/3064510205.pdfIn PDF document text
    • https://loctra.net/userfiles/file/88837707736.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/d971aouftuuojrigs9ukgj2e90/66199276358.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/muzimibolezepavezizupuxes.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/xabuj.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/malebovopebenatafopadalij.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/norepojadij.pdfIn PDF document text
    • https://digireg.dk/upload/rukofopugux.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/48507650405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=daycare+enrollment+form+pdfPDF 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_off0000f1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AC 10636 bytes
SHA-256: aae9c9809e8e7d51d7d8e150accca9e6d79963487d1ac5c0d895c9d3c4dca7a6
font_01_sfnt_off00010a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A06 17244 bytes
SHA-256: 78b986c0e50a26ccd0e8ab9735ee7311a932d75d7fd2f551d5412729f573c9c0
font_02_sfnt_off0001365f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1365F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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