Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fb1bc53d3d83472…

MALICIOUS

PDF

73.1 KB Created: 2021-09-06 10:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dee7081006f6d6bbd3e8c268e884fd00 SHA-1: fb01012bea73a1ebd6feda4d4250791c820cac7c SHA-256: 4fb1bc53d3d83472ecfa2494c1c0dd0c1e65225bd89fcc93c0e3378f6b4f2862
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to external sites via malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/fb5c47c02743f51dfd7ccd8c70bb7549/tozunoxuzunavimamiguvima.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161103363162da---jadawazaxobebasujat.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc552c76a---2164469726.pdfIn PDF document text
    • http://www.toptehnik.si/images/18716731708.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/gawujusotitokakole.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/gefamapim.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/21467091808.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a16ac1d3744---80588512376.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/gilit.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e242af355b3---narolagujedukerafexugi.pdfIn PDF document text
    • http://servmed.net/userfiles/file/76535029130.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/39024498960.pdfIn PDF document text
    • http://yuhongzg.com/d/files/divatitupekemerob.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rpa4h3jog1k4e1f4j7nstnkavt/63501459269.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/f3v51hkou5nf5g62ffasm3erg6/80865785182.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/26950607082.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e4ba12583423a927e81dd09767555975/voduxoxe.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/68535fc2c4462081f15509570a90503e/21408180635.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086c456c4c63---44189848904.pdfIn PDF document text
    • https://dm288.rs/slicice/file/78027670182.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32c83ae24a---vusexetusawinukexomuvowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=condensed+matter+physics+thesis+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_off0000bcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC8 10984 bytes
SHA-256: e5e92243a48e2d71f302a0530388cbacb81af3c9c0f4ebbdef982c9c68a35443
font_01_sfnt_off0000d626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD626 15844 bytes
SHA-256: 571e6b02326eaf7254de0386ed6d36f0d3eaeb447faece72ddc34aa4bed29341
font_02_sfnt_off0000fee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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