Malicious PDF — malware analysis report

Static analysis result for SHA-256 318c3bd346132ca4…

MALICIOUS

PDF

75.9 KB Created: 2021-09-25 02:19:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48071b9fb7b65cfdc6e87ceac073e49a SHA-1: 791dbfae182872e434ad48237ba1b6c51cd59a0d SHA-256: 318c3bd346132ca4d17fd989262c90f608937a8f2526c3fc83d3e6c54f79be9e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a link farm pointing to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/68b3e7d8387717ab7714ba2f392076e0/44924476436.pdf In PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/40134199810.pdfIn PDF document text
    • https://tomas-music.com/contents/files/65012398525.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/428620794.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/farofukepu.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/zepujajinakajolati.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/tuvadupusutug.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614740ce0b1eb---24240838292.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/75652673729.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/72231871403.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/58958017315.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/fewinivinukunazopuj.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/863136b59b4baba14171a86073a56430/fenuz.pdfIn PDF document text
    • https://suksesunited.com/contents/files/lezukagosukewo.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/56854451939.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/47294247507.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210902014345324502ajp8gpp0ue6a.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/83271745995.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1a971ece5---29390848585.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/nuvudowipeb.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/kosorekeg.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/6412278574.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/32131979102.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/32176540296.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57012694425.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/nafumiwomapuru.pdfIn PDF document text
    • http://didopack.com/files/jatifopuxulef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=complex+analysis+schaum+series+pdf+free+downloadPDF 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_off0000bfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAC 18312 bytes
SHA-256: defc6af5fc8a9788732f0a7830c9430453acd5573504aeccbb5528dd88351e26
font_01_sfnt_off0000ef64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF64 11220 bytes
SHA-256: d3c19ea48fd1374c1099cf7759249bca79258118d8f72374cbd79a3df332beae
font_02_sfnt_off0001098c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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