Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62da23a17fb01ad…

MALICIOUS

PDF

75.3 KB Created: 2021-09-05 23:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b458fe364a0ce6176b148a8660d2c3b SHA-1: 214ef17614d0f3c6be3989b9ef00820444594656 SHA-256: e62da23a17fb01ad1cac55af04784a694309b9951670768f273ad5ba503a80fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://loadcell.vn/Images_upload/files/palaroko.pdf In PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a344836e4---zevimubo.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/betonibezegidevarutotud.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c3fc8d5252b6067d30e5d02b38d6f18d/73013133536.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffcfe4971c---tamidazew.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/gufedurumujepuxizun.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4394bd5777b83afca723bd330ef2540a/40356940885.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/413420316.pdfIn PDF document text
    • http://dhs1959reunion.com/clients/871764/File/77238178871.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071ba8f48c6d---wifobaxireron.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077169688057---xasanujozal.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/71750972412.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/98050904291.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/umldns399q08dnc5svdt3kpm1d/96389670781.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1b00e143---jeluju.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/ridovar.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/50497070138.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/nafasezotunifa.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/17136609806.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/jalutinifukubedirolajogug.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/14de2f6408a206cf601356c53e19caf3/mowug.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/wodeloduxuxutiveki.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ab86df9904185f0dc74b888cb2f6467b/zanokigedavar.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16080ae76b5d2a---99448401457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=modulation+and+demodulation+in+communication+system+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_off0000bf79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF79 17732 bytes
SHA-256: 18525795fffe46e7528350bb9fb5a97e99be27497f2d6a592e22487ccd5b2e5a
font_01_sfnt_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 10888 bytes
SHA-256: 1f7d93c8261cf8ee4e870392d1b2dedca0cfb5be73f480a965279a12177a9f0a

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