Malicious PDF — malware analysis report

Static analysis result for SHA-256 3669d19bd7467cf3…

MALICIOUS

PDF

79.0 KB Created: 2021-10-16 01:50:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8397972d52caf33d27fbda72a81ed837 SHA-1: d86e47e2861e0c88b549292040a306340de4e5b9 SHA-256: 3669d19bd7467cf33e65b601700ea926c38e0abbb95c496a7daff41468b1109d
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oroblupiscine.it/userfiles/files/gowupetedarurim.pdf In PDF document text
    • http://maimungkorn.com/UserFiles/file/talaror.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/domisesolev.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/34820184274.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/fadurofijuxamizexodelozu.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/26754562324.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/bimin.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140f9958a8b1---debad.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/23277591522.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/78206704508.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/bolerorasa.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/lolijebu.pdfIn PDF document text
    • https://eetravel.net/file/33733084438.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/famokad.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/vozavuvopugubuve.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/2999657211.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615422eddd27b---56061069043.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/wazow.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/78078312359.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/93105547526.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/tukavuruzivapa.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/e345acb0c05b1b15a9f572f84116f6e4/95684764403.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/pexuzov.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/00626a83f0bbdfd8e12dc0607191b540/18126920738.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TxADE9PCSUw/uplcv?utm_term=how+to+give+formula+milkPDF 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://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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 17504 bytes
SHA-256: f021f375a639de317676136e1a2bb7db3d75bf5f30df790b2a87d2131a447e4a
font_01_sfnt_off00010310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10310 10620 bytes
SHA-256: a122d37ea60df5a4e391289bc22bfca08f8d26ffe45a1a9a6057ac364445f8fb
font_02_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1