Malicious PDF — malware analysis report

Static analysis result for SHA-256 909c581dd255c524…

MALICIOUS

PDF

76.0 KB Created: 2021-07-03 22:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62cccb27233b4fcd27cb67ff10bad603 SHA-1: c083302956afd3bcf3f3ecfd70bf91f07a1a82c0 SHA-256: 909c581dd255c52403290454aca75bcc686d98d39c18376c67e7399c5d1aecd6
154 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicative of a phishing or malware distribution scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to external malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7328

Heuristics 5

  • 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
  • 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://bsa.by/ckfinder/userfiles/files/doxesexanul.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/zupawa.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/85970176033.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/4418902e4e07e5bfcd93eb04836380c8/mavedurulofivobize.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/romipusezetoroxatexo.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/20503218966.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/mv05uhs49plpmuu5bi26nqbhf2/69668585688.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070fcc3abc6e---40209467149.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6fd7968c---23211426130.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4087314680---81365906642.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/19763408900.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/69992440285.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qdmllquq9op2hsrsg97638eln4/lidirirafuk.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/vajori.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd781b6749---wavodexupote.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/o129qcst2l0fl4oh4onvp1ea8n/19575250663.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/362fd85af122cdaf87d93bcb0e6197d3/16409727019.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/63220777901.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/lerezevakiruwukowefu.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879892ee636---80492202492.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3ce51258329659ccddc3d384c4e010b7/25355953844.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sikalax.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/385a9524d7b88959175396e9438d9e52/wixopetupubozesib.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/mipifademawopu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/pezalinabifijemixitatavug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=zombie+college+lab+safety+worksheet+answersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 16792 bytes

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