Malicious PDF — malware analysis report

Static analysis result for SHA-256 c004b2330aa92f9b…

MALICIOUS

PDF

86.2 KB Created: 2021-07-13 08:07:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2898697232ad1f52f62143264a1a54f5 SHA-1: b1733a9dce6bb38fcd740299fe56dd019f61427d SHA-256: c004b2330aa92f9b1ae580c8b1d602324434726b109f62ab48ddf20a88be77d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, likely intended to host phishing pages or further malware. The PDF structure and embedded content suggest it is part of a phishing campaign, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://talleresjpg.es/img/file/54582519978.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4d815bc55c4614a4081f0c53d014da49/91530370461.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16079741018841---38911075827.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/s5vfd9nnnv5gbbt47unausg5bm/wufal.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3b4e28fa74ea94ca1160f78a7da5bdd2/36096285343.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/nevenijokini.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/bimebonewuvomiletisu.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/23911984072.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/dujoriporutozowamafi.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/62300214036.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/mameradumunepije.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/71fae424e01e06990c7e02f881d13473/jazozu.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab529ab3a21---54140324044.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/61061028482.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160854bbb1d99f---56109623024.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/tebumilarunixogemisoga.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/tapigozofemeku.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be257b66f09---vapisobiniregibufine.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/salajotifipufigolepojin.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/48837248868.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/62374964397.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/28736811951.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/40720bc21f69ff9779993351c7e97699/93781452269.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5nthsv8pebfnlicle5tc5peh0l/xanudatadevozuja.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/3900994519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=water+fasting+to+lose+belly+fatPDF 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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 16624 bytes
SHA-256: bf55922aa018ad14e01da6e8f0eeb9586818e185d3eacf4e52647644bbc224a3
font_01_sfnt_off00011ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132ED 10636 bytes
SHA-256: 1fff9eb4a06fbdc033674db92bae83b8e4d7fc91ad5419c420c6cf296c173153

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