Malicious PDF — malware analysis report

Static analysis result for SHA-256 833753c9f03777b5…

MALICIOUS

PDF

101.2 KB Created: 2021-09-03 22:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: abd5f8af7d4260e60377bf2376a2e632 SHA-1: fecde39dc51b158fb6c8538e4f637a0e42d1e29a SHA-256: 833753c9f03777b5e45436a2455e333d2cfef31efaf49f0de67301cbbd8de487
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains a link farm pointing to various PDF files hosted on compromised websites, disguised as a wedding timeline checklist. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to distribute malicious content through seemingly legitimate but compromised domains. No scripts were extracted, but the overall pattern suggests a phishing lure designed to lead users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://brianhaymore.com/images/e/file/57763200942.pdf In PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/bokowerugewakibatovi.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bf7518553d5c3e38f33f63e60b1d5e53/jidezawolinijeku.pdfIn PDF document text
    • https://saam.vn/images/content/file/12587209730.pdfIn PDF document text
    • https://adci.vn/data/upload/file/kazujiwijagodotil.pdfIn PDF document text
    • http://atraba-holding.com/userfiles/file/volovurubipezetat.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/2888330498.pdfIn PDF document text
    • http://rogalafamilyreunion.org/clients/0/0d/0db8e8e54aa701f14f52e26b989c21c2/File/89480338259.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/70589626277.pdfIn PDF document text
    • http://isvpro.com/custom/files/8160081037.pdfIn PDF document text
    • http://htwy.com/upload/file/pigefevamabekozogax.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/ralunirile.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/36622718851.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/58710069316.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dacae4c33---dexiw.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16087747e63cbe---pajojama.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-02/images/files/92680244904.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093fbb8317ab---piginosojurelexewazabugu.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/zuwerirovozadejekezivimuj.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/vezovomabag.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ooj7ip1pkm8c5gu36q7u9ed7f4/riwevamamule.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/21126873440.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/ga5qv5gr7meih65c51d12hi70p/7517388056.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210617_03D30F9F1A00544B.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wedding+timeline+checklist+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 10768 bytes
SHA-256: 647020d6657c91349febf3df728f51e390da18c2887d6c50b8ff847d1939d694
font_01_sfnt_off000125db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DB 17684 bytes
SHA-256: 8ba3880ce4332c376bac9c2f31f31272753659ee194f77f813afa3d0bca573a3
font_02_sfnt_off000140a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 17848 bytes
SHA-256: 30862e90180e55c60356a7ccc7e171e3c43da81a3ecfec77471246585b484e90

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