Malicious PDF — malware analysis report

Static analysis result for SHA-256 957fe67732296fed…

MALICIOUS

PDF

93.5 KB Created: 2021-08-15 17:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 248b1361993823cc5f899c09c2f83d1a SHA-1: 48bb7c21827c6376305b839198ecc0f3eae186d8 SHA-256: 957fe67732296fedb4be0c896f4c76eab218add5a392d0ab625136541859c5fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm pointing to potentially compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external URIs, many hosted on what appear to be compromised or low-reputation domains, suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://marta-galan.com/files/varios/file/64561933553.pdf In PDF document text
    • https://theelementrama9.com/userfiles/files/bekuvavilinifuxilafinoje.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/dbe42a5a2fb7bca706ad419b580fba90/53930855737.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a9417619f---73265896316.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/50118173210.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cfa44fd1a---fobem.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/xoboxulotezunukiwabimi.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/pafuxepogagedanalu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ccc3443bf608409696f4f3023122c5fe/sitizewuvirokutujovi.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a4d8d1d4---jawezitudekifuwonimo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb432f534---47364002794.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/57446052441.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/raput.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9dd93c36d---91566138479.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aea011b33d8---35179852243.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/10262747524.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/38659708868.pdfIn PDF document text
    • http://robbes.nl/media/files/zerafepizukepowufe.pdfIn PDF document text
    • http://inistor.com/ufiles/files/25086963310.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e72616d7c---fubomorijo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a86865c0d---mojav.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/zilugetimuxumozivosuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=libro+de+matematicas+2+de+secundaria+contestado+conecta+masPDF 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_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 18876 bytes
SHA-256: 663fdf4eba6c5f61b0470d01b7e31cba158a8f917f2cb9d8c40b73cfcf756c42
font_01_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 10800 bytes
SHA-256: d3ddaf1b185e9d30434a5748c3e97cb41d47d1b26147ddc3756dd90a84c58406
font_02_sfnt_off00014d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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