Malicious PDF — malware analysis report

Static analysis result for SHA-256 8379eba1fc7d63a3…

MALICIOUS

PDF

81.4 KB Created: 2021-10-07 10:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a30746e22ec662439c9f370638527060 SHA-1: 4acd1c0c2e63a43f9c47f71f48176c0f1c82621c SHA-256: 8379eba1fc7d63a3225a883f692aa53d7c6f7e10c798c4e4d986818405904001
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to disposable hosting and potentially compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of many external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/mixepaxamanakolatofe.pdf In PDF document text
    • http://fabtur.ru/upload/files/xegopajosotavoza.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/sufaluleve.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/91063853022.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/15666128624.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/84665567622.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021100312072667.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/katuvin.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210920082625.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c91dd3a88---lufep.pdfIn PDF document text
    • http://test-immo.com/file/bewobelerelawamegakum.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/75455066180.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fd8c82f94c4cb493c8e1f39615b8226c/rokaki.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210916195729.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/bimafitujelubuleka.pdfIn PDF document text
    • http://domexpo.ru/up/file/4718574615.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/kurajefubokimiwijopax.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614231ec4b01a---xezugokajidigopagodixob.pdfIn PDF document text
    • https://e-room.co/userfiles/file/wugimazidekav.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021091210312173499.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/jaletosajone.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/34310851651.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/gexiforogotinevop.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/42912116429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+unblock+minecraft+from+firewallPDF 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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 10740 bytes
SHA-256: dc72ca27d46d9b2b06bf882893135943e690d52b7c44dffe1ab2f80a0133049e
font_01_sfnt_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F1 17604 bytes
SHA-256: d4f7e147da15dec38c180f3fab35cd956fd6d3bfc6c04521aab9af95300df2ba