Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc6c9cc6447e8ce…

MALICIOUS

PDF

98.5 KB Created: 2021-06-19 05:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a5045b53e2fc18fea9b531dbecbba696 SHA-1: c7feae126cb4ea97316e5515e0a52dc59c1f1a4f SHA-256: 4fc6c9cc6447e8cee6be1bab3bdd32da645f7ea87d113ce79f44ba6bb52ea04f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and numerous external links point towards a phishing or malware distribution vector, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/jh1i15os7sls6s4g417rpqoi5p/miwetubejebirulut.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc55a5a09a---jaxor.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/sivekokaxususogokevowoso.pdfIn PDF document text
    • http://www.bash.cl/media/file/riwujuridavome.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952674b0956---gifep.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9bjsl4cgvj7sp8a7u8sv26bos0/92504730324.pdfIn PDF document text
    • http://siembra.me/uploads/files/bazanutifemodowukipoja.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784fed6864d---sopiwugojazetepulitate.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fd4b01ed---firekibajup.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file/%5C/3437688640.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/85035617154.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcsucb3lf1amihsqo8cpsahtg7/61361331433.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f02859760e---vuwewonilo.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/16937247766.pdfIn PDF document text
    • https://eternalbliss.net/file/15089705987.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/42169282982.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607822197f7c5---gonan.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/tinoxumobe.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/52497187562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=english+grammar+notes+for+competitive+exams+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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 5652 bytes
SHA-256: 0b2157480bcd1b411ce58ad6d58c4bb0d0ec2cfb8c6d6a7742cb77fef01ec626
font_01_sfnt_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off000132e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 11140 bytes
SHA-256: 5c6f95f1f788aebe24a3a74189e164da276c9d9529b38b3d5d033f3b42900add
font_03_sfnt_off0001592c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1592C 11264 bytes
SHA-256: adf71cdc8af869eba1a7f059c17b151c4bd67753209349ad8adc6ff4800539ee

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