Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56ba77e90415573…

MALICIOUS

PDF

90.5 KB Created: 2021-07-23 19:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffd9bc665244a3ba23a98e9044fc9ece SHA-1: 08273adcfee401ee23e50f8a7692c8a18a7dded7 SHA-256: d56ba77e9041557308d2ea7d5b07a240824a9e2f654edc520ee387a03dfb691d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://shethof.ch/cgi-bin/dynamisch/file/midemekukiponogaro.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608999a44c548---64492262251.pdf
    • https://nadamasristorante.it/file/kewavonixeponagiki.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bcff3287d---bovuxevovememe.pdf
    • https://sedefartphotography.com/resimler/files/zeruradorujudo.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/da3965dd000c954069d62afe125c2d2c/pejefukesi.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a501a810644---bixil.pdf
    • http://thunderstar.cn/userfiles/file/20210622165622669125636.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7tqt7glbnnidli6toc0338daro/fefet.pdf
    • http://dreiseengrundschule.de/files/30187217091.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e217a9b8acd---tokeferifunajevumurerofi.pdf
    • http://iuf.kr/pds_down/files/55595842376.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/a5a4ad162cf5ff136d7e5fe605eea7b6/lufitonorepawidiz.pdf
    • http://karthikeyanjayaram.com/userfiles/file/11670178859.pdf
    • http://abnicum.com/files/file/52257848496.pdf
    • http://daonshop.com/files/fckeditor/file/lezetosanu.pdf
    • https://mokhalasati.com/userfiles/files/35842062712.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0dbe47aa0f---virofejiwojesubutirasevob.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/94404019654.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/034b9ca785d609dc0d546e7695cbd54b/53641552336.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e9510bc9f---jafemedezivexagapo.pdf
    • https://ochronaskory.pl/pliki_user/File/11190782157.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a816d3afebf---jomotimumepatedumaliv.pdf
    • https://baobihungphu.com/media/ftp/file/74653181491.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+del+usuario+chery+qq+en+espa%C3%B1ol
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f85b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 16792 bytes
font_01_sfnt_off00011072.bin
57cdf820106d94419d4080acce6033ff499a639292959ec4bb3fc2922ded58be
pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 11072 bytes
font_02_sfnt_off000129a8.bin
20c48465c9bc132551ed0f41f1d378479b09dcef91b1d01691fc9bcfa148714f
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 18872 bytes