Malicious PDF — malware analysis report

Static analysis result for SHA-256 514738abe25f7fc1…

MALICIOUS

PDF

96.2 KB Created: 2021-08-02 07:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2fab03e3dcec4325a2dc92f9b5658ee2 SHA-1: 84fff95441f705abc97614465a8f91bd6e6ebef6 SHA-256: 514738abe25f7fc1a0961326ec34b29df39298922dcb60f8a707d1842e106944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs suggest potential for further malicious activity, such as JavaScript execution or redirection to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160929a6d7820b---woraxutalujabusipojanizi.pdf In PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d6098940c548a35c1e4ae0fd3d4a3cd5/retunojagusenewogot.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/evt0ggl3422cc7de7hurv5eo9f/35583548546.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///96703865994.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/18889080088.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/82091989596.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996428cee93---27702318797.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c90810c5b---nikitowog.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609de3d372b61---jegekowerujeda.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/mjkp42t2v0ft0palvj7kgqt4q0/butetepunolit.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/10700749559.pdfIn PDF document text
    • http://www.asslar.de/downloads/5962283689.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/rinebonusorezuvawole.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/e50b3c5f826474b135a6bbcf8b135d42/85427942695.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/0735e8b130b4d0dee7b655a08120ef81/87110387893.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gob95dvtpnh0drerjv0d3e86i5/ruretowaroxetedepizow.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f53d33ae1897a9f39019e65bacc7ff83/89312146112.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/28010568777.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/q4tc0822t9plq7idv54ahbo1r7/58315998182.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/xapuwovan.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607764bd508ab---37475133619.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/940592f769a7f45b4ff35023dac99e8a/setitapoxitolusamu.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/k5lsl5drj45b1ujvsogg0lhdb3/25778848804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=aged+care+interview+question+and+answerPDF 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_off00010e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E19 10880 bytes
SHA-256: cb24994d3be3e32d2ed9430a70d7a880c403f3448315a0d5dd1941565e172ebc
font_01_sfnt_off000126f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F08 19964 bytes
SHA-256: e5a38a60caeb4a0a6984d5f4e2b98c5482099b683335b12cb2a238911066070e

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