Malicious PDF — malware analysis report

Static analysis result for SHA-256 f95fb49af9bc373a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 00:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12cc3a3bdee8a1f45d55cd0a138d2a72 SHA-1: 9324e5439f350803701946e4e6d29944f3c0622a SHA-256: f95fb49af9bc373a1e42015bd005e608ea12be832096bcddf018b9322f15e053
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac7d9bb25---kuvunilorarulok.pdf In PDF document text
    • http://itps-group.com/uploadfiles/file/78530789152.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/22857206094.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/46938294922.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/6275552939.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/raraxefulovawufi.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/setine.pdfIn PDF document text
    • https://littleedupark.com/ckfinder/userfiles/files/gadusat.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/11912260623.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418f4417718---gutiseve.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/revawolib.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hkpa5u8gp1ggjfnr5isg2u57e2/26730199596.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/duvexebipuzubanirunapo.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/22757274871.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/xetonajepop.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/wuradesarar.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/39005340997.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/lapiwosapidiravidobef.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/bedusujejevawobe.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/pigoja.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/suwenunevabesep.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/51084774425.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/42421566640.pdfIn PDF document text
    • https://curvy.tw/upload/files/44009714395.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/28699735433.pdfIn PDF document text
    • https://jotelek.hu/files/file/malifamatavofuginawedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=update+one+ui+2.5PDF 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_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 17336 bytes
SHA-256: b3d774413d8d7da285f66dfefcf13b5dbe4cd27dbbbc4c4e9b1925703ad77d8a
font_01_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 10496 bytes
SHA-256: 3b0460987bc6abdfb4899e99d7509c2775202b63b02010744a2518d0675858bc
font_02_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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