Malicious PDF — malware analysis report

Static analysis result for SHA-256 83086cda10a62f26…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 09:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 55f042b468886f8f885e18bfeeaab22e SHA-1: 4edb3970155b95b122f3679039916ded656a85bd SHA-256: 83086cda10a62f262f799ac54b7f5c82fe5d221cd0afb7f5d6bee6d2b6db98c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves exploiting user trust through a seemingly legitimate document to redirect them to potentially harmful sites.

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 http://elcolono.net/userfiles/files/63635429714.pdf In PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/bujixozikuvox.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/65672943365.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411244ab9af---45833240260.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210915142722_bggxye.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/9feb5b312350a4303d2a61416b72fe7d/78321992902.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/rujosetodevozineworu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/a1880c9d6f1fa2f341c456519f9a9b07/47766854568.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/64703434073.pdfIn PDF document text
    • https://iohrp.org/f_files/files/64199460813.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/79512715176.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/boxuzexaxivesubogove.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/rututimosede.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416c457af15---pekanolinani.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/17131284936.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/pomowuwikavizonewa.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/pufopubirivodujadomuvati.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f509f5a097---lekanul.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/20453880022.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/danovimixir.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/9583787948.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/65943506085.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wamipuzipuxebaxoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=citing+in+text+apa+7th+editionPDF 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_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 17644 bytes
SHA-256: 83c683774eb1dd5e612af88191c74fbfd829db6899c9766b9bb094688fa372d9
font_02_sfnt_off000121e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E8 10540 bytes
SHA-256: 9bb353894eef845256bfc26bfca970b54f1c74796bf892831ad0c7e7b7c13eac

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