Malicious PDF — malware analysis report

Static analysis result for SHA-256 5452b1b2f6b4484b…

MALICIOUS

PDF

77.6 KB Created: 2021-06-10 23:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9e294a722bc5b6a770f48560b65e9e SHA-1: 3ad332e610182938451ce93483d2440d3c1a4680 SHA-256: 5452b1b2f6b4484bad12f62e3c3d313c171dd424e9cfad0e56b0cfc30a9cfbef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the links indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://irlanc.ru/uplcv?utm_term=4liker+facebook+2020
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/307dcd4e08652db359bd6cea9be253c2/fikekenarelelupuj.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e84abe802---90777517961.pdf
    • http://bioident.pl/photos_fck/file/3163225175.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c03127b3152c9e5859b1b6e2c804346/74367552812.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/uq0gtq17prkttocriv9tcmme02/lubivenarofowokuxusu.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ecb89b281e---92748984952.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rea9r53q899d3fem3ngaa4dsb5/zumolarowupif.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b84a0c60490---xapowurej.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/82bcb0e4fb78d70e066f4e52643e8fce/divelosozegipu.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d5f84c533---56632844167.pdf
    • http://lapenya.cat/imgjovesnaves/file/44840300601.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vgn9di41lkg9e4b4iu2ce4q6j7/52882481819.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf39f3ab7---todibusesifusawiwulukof.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ch3k21ntq4gpu12invvn7r4dq2/wajoxorajabuwogezaf.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/9f75e54ce7300d5e9f619ac32ff450fb/ritik.pdf
    • http://gorisum.net/fckeditor/upload_file/file/53579273335.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/b6gqs7ks753hl3aaf2thsogbpl/milidosaberesajum.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f05b.bin
c95c7a56a2c25b8f95295730d7fed251ed906e6741474b1e7038843d5fe8ffe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05B 5168 bytes
font_01_sfnt_off00010206.bin
4273abfb81c810420ad48a057b305ab2a33fa4d2c95d3e51173713d29aad7e43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 11736 bytes

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