Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01b0fd4a052ce86…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 10:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e69fbbcf1070ee4a21c999a56d02395 SHA-1: 4f3e4f507e840f13918e0aec7e528898ac51ea91 SHA-256: d01b0fd4a052ce86699ad28e7b13fda011990faed834f56ac79f0ea08a6ba43e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://fotofolliasanlazzaro.it/userfiles/files/mudufurapekarubeli.pdf In PDF document text
    • http://maivietnamesecotati.com/uploads/files/47307995242.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/majolotixifijuwofovej.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/sujasik.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/bibonasagaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613174663be30---ruzoj.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecaadad438---takijikete.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/57527789999.pdfIn PDF document text
    • http://wuchem.com/upload/files/28160348247.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2b4ea4af84c6d0af58aac0c645a87deb/16407860684.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/54986303021.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/lasinesaxegivobab.pdfIn PDF document text
    • http://effektfilm.de/files/file/66495298451.pdfIn PDF document text
    • http://timebymtm.com/upload/files/8027982556.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090315285398.pdfIn PDF document text
    • http://anpharma.net/upload/files/tetupopasabepen.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/kirukemevirifudib.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161301cc65d48d---35833929787.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/sawiliniwob.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613551f5538e0---93889487228.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/88841634913.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/94352558710.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/86221335809.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/40168823462.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/pulugodidemuguwow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=remove+document+restrictions+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 18300 bytes
SHA-256: 02642f2654df5fbc85fdf584f2d19b477815f6b09d2c765d49d017dbe3712698
font_02_sfnt_off00010c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C42 10784 bytes
SHA-256: 008946686287e8970bb21183338a76fbdb59591531007d720bc55b96765243ac