Malicious PDF — malware analysis report

Static analysis result for SHA-256 350a1aac1b9b9b3a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 03:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a803d9a20586e71e6a5891100e1dd21c SHA-1: 41aefa58d897ec59505dfc94f0e7e59af51e4282 SHA-256: 350a1aac1b9b9b3a884ad58d7afb2e364b30f9454664b461fc67c0dbe2f78cd5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of 'utm_term' parameters suggests an attempt to track user engagement with potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=lucky+patcher+free+download+for+iphone+5s PDF link annotation
    • https://deesudcoolingtower.com/userfiles/file/94445628982.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/92692135877.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/11536378229.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/noleb.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/54009357892.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c466a6a089ea0288dc3a66f582fdc528/tikunuzovisulakulejijem.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/6d95c74c153e875ef6aad2bfae5267d5/84519388981.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/vudinajutofetu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333812940ea---41043814037.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/82199782724.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/zobewebozikegilituro.pdfIn PDF document text
    • https://panama4d.com/contents/files/lidal.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/lodujajejopopufoni.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/15049656670.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/3729426375.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161326410a9cc1---rinemekosevusezafuvol.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/67624890335.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/powumozidikegipase.pdfIn PDF document text
    • http://shopabrang.com/images/files/balunasalupoga.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/fozinive.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613536789fc8d---7722765966.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/22737445206.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/pajapojedotetesavu.pdfIn PDF document text
    • 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_off0000cc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC84 18824 bytes
SHA-256: 39280f226daed8674f8bf953220b9a0f13373a63854758356fdef4ecf0cb852c
font_01_sfnt_off0000fdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 11200 bytes
SHA-256: cc30177d3184ef04dd311767db6877044190c0d687249cb4453f8a46eaa897a3

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