Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f2f48bc7bf46e8…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 14:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 51ab0b90e81dcaca88e1685e666d3232 SHA-1: 71c0cb5cbdbf997d2d4199f8e66938db3ae18700 SHA-256: 87f2f48bc7bf46e8beeb918f70b46d3ed1077808d382fe20c5efbf4f3ca09063
126 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading additional malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier clean score 0.2136

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 https://demircanticaret.com/userfiles/file/43307759444.pdf In PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/xefesumosawiwazu.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/26685234170.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fd8f2c84cd4444e09dafe181c61d95e8/33097928122.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/62017599172.pdfIn PDF document text
    • https://heureka-cz.eu/files/8999824407.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/27084986201.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613145ca72610---23538199051.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/5132955009.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/bobabugiwixaxapodol.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/mutokidoduvinisovidovupug.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/86952827002.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/buvovuxusik.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/fc3171df1190dd2afc97a85f3d768162/rakuxabelowanogim.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/nokepoderarejovobevadinaw.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/63015220683.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/38643859771.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/17080147971.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/vinolabedodonugisosij.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/dc5728d854ad444b317926a10e45f3cd/78583926048.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/13b742fe23cb0e815bf5daf2efd2c6ad/dokubamokuxasoruvazuruv.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/fewudusitoga.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/63503537938.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16132b7978c56a---43103596870.pdfIn PDF document text
    • http://kodemari.info/data/files/demavapumojofakol.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/91476942847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=spider+stickman+fighting+supreme+warriors+mod+apkPDF link annotation
    • 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_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 11372 bytes
SHA-256: fba44d51d177d7419ec6df7df8a202ee6385a9912a8d3a02ddf10f03ad5dbb27
font_01_sfnt_off0000e0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BC 19884 bytes
SHA-256: 6417e1d14f019aa5c6b408ce35f63140dbbbd77d8a2bec25c21ac12465744ff1