Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc4183df3b5556a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 06:43:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fe5100d831f47def63cf613fe6a84594 SHA-1: 0844596220b92547b84b20af3e9e3b12a889fc77 SHA-256: 3cc4183df3b5556ae882f5908a9c8020f1eaac417340f540e4fbcc97295af56b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a ML classifier and ClamAV, with multiple heuristics indicating it is a PDF link farm. The numerous external URLs extracted from the document, many hosted on potentially compromised or disposable domains, suggest a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=download+petal+search+apk PDF link annotation
    • http://immodraft.nrw/images/architekten_agentur_images_/file/55810808106.pdfIn PDF document text
    • https://uangraja.com/contents/files/61880672033.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/nofebo.pdfIn PDF document text
    • http://marine-inox.com/i/File/61985478877.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/36189885573.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/73979338837.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/fonabu.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/6669508945.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/72204706008.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5459e6979801d14f8fc83983f4741dd0/juwaf.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109061158420341.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/15823766771.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/lufanetikikimuz.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630530825_2ad848a803.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/4011531458.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/15334710044.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/xerepokawitopofisajo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9721110a---lavoti.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/2d9dadb5686f53e8284d59850b7e3c3d/jalefulojafakev.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/42992000480.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/45922771020.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/87818771574.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_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 17720 bytes
SHA-256: d822248950ed0109f1ee4c36e62ca511e4f9f79c3e4ac24d10f6250677c5a118
font_01_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 10696 bytes
SHA-256: 08a4b5ec35fdf4a07c99b01035492100689a0edab6cfccaf1d726de1f3370115

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