Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d23b121e7db3fe…

MALICIOUS

PDF

68.1 KB Created: 2021-09-09 03:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6b864ec52a6c49ab1fb17e4b5a4b13de SHA-1: ecd1c97ee135e7f28c7b8b8ed0c9bb97874387d3 SHA-256: e9d23b121e7db3fea15ae836db3ba48579a5d08e83dd9e4aa92ef88c12d68828
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on compromised CMS platforms, designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb7a6aa9e---8230770693.pdf In PDF document text
    • https://hyosungulf.com/uploads/file/naxapininelajilil.pdfIn PDF document text
    • http://yarpb.ru/pic/userfile/39234256903.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c19cac48c---kelirodepapewesijafelida.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/dilizezemudezeju.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/guxuwagujufimufizo.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/kenavawazagogasom.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/nakapokiniret.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/joxabazev.pdfIn PDF document text
    • http://retailcop.ca/files/94248145410.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1344c130---nalibaximoberavak.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138511c6e230---tuborosej.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/27410742514.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd0a3c812e---venokiduzi.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/zamudawajafezare.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/sekepapibazomotemijijo.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/38478088131.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/dalanajopelek.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/pumaliweziritovotewinoru.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/94969596925.pdfIn PDF document text
    • http://canadianrockies.info/files/file/4407049069.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210906_135219_140.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135913509823---79925808047.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109022352518288.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/6529640221.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebee9b2b99---80159818694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cast+to+tabletPDF 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 9976 bytes
SHA-256: d4ea6d5c8d9444dfc231441ef8e66cb195f1acd33d45c21b5ffbf34d5871255e
font_01_sfnt_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 13968 bytes
SHA-256: 8d2ac1663eec096abc4f81fecea47a2d6a6432e60c4d8061d5d52133214d4d8b
font_02_sfnt_off0000eb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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