Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cba4f70d88465c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 18:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 60ff44c2e6fc8792e6f2d5f2234a0a27 SHA-1: 20b2e03c8ef0e1c991e7050c727736059939078c SHA-256: f7cba4f70d88465c40611869552ea11f6e3484ad34f0a2acdd20bb28ede879b0
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The presence of a link farm on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://uptownchantilly.com/uploads/files/mebeduwexapexedetelog.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/izisa.pdfIn PDF document text
    • http://world-system-packet.com/userfiles/file/gilumojogafemi.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/31885064317.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/lupubevevuforo.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccf20bfe2f---nupegodirupazana.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160731dfeb486b---muzaral.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bf114a366---pofilawereku.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/rilisax.pdfIn PDF document text
    • https://a-guskov.ru/uploads/files/vatezalomarozekunorama.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/rtbtargibvclfbarof8tofrj82/56856045675.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/wunanurowo.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16098798f6322c---94297638052.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/mf3q7msis4an9rjasm6d25c90h/jetepifopepazitux.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6b3a4e94b---18154748576.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/lumiwinadev.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xilovisikupixije.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161235c909867f---71829392790.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/legazuwijizilepedi.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/39157385479.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/kiwotuluduvasal.pdfIn PDF document text
    • http://groupkaishan.com/d/files/84097106775.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a666a94c3---87659207761.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/61760986470.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/65963070544.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/nemojatikogit.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160723069bb05a---zinituno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fran%C3%A7ais+communication+professionnelle+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_off0000d33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 11056 bytes
SHA-256: 6a48697798012396eedd83cb70634b8b054a5249530867534b6acc92152d3bce
font_01_sfnt_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 20088 bytes
SHA-256: f18089998e8eddcd989af2247239f8d9341066f0aacbcfc7aa8553957005dd1a
font_02_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1