Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbfa1cad8588de6…

MALICIOUS

PDF

74.9 KB Created: 2021-06-18 03:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f14de89e9e69c8c08eae5524646e1d31 SHA-1: 7b5524306770a431b458fd2ee9e4513e68475515 SHA-256: fbbfa1cad8588de61921c29b5f71c8157bd63fe66b3b53cf024c7f8fa73e0efa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many hosted on compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://crewmak.ru/uplcv?utm_term=naruto+shippuden+episode+176+english+dubbed
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15948e95e---2239797166.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089838729845---mokubifomusef.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160757ca92bba4---15837595013.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ae115e7fa---koxofagal.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/36389563008.pdf
    • http://phuocthuan.vn/images/pic/file/mexatopinividudaka.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f9e20efb---97758410029.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c719da8a36---koxawunujatetabilurejoso.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071e182941a5---4622677583.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a85a797d6---72448704065.pdf
    • http://anandamsanyal.com/userfiles/file/47242292758.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gomatadinatuxofemawewaf.pdf
    • http://amadpich.com/userfiles/file/43906014537.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f9ggn4om1flirh971egspeotlp/43849672549.pdf
    • http://all-pass.com/folder/editor/file/33917782233.pdf
    • http://jamessham.com/admin/usercontent/file/nujutexiku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e532.bin
4a2f21bfe45e8c2c70594d75e8b9a55ab5a23911655daa286f0ed0e05103c6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE532 5616 bytes
font_01_sfnt_off0000f854.bin
012af878eeee99ce185e04473f928aa6b7db30dac4379262135364193192c5a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF854 11200 bytes

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