Malicious PDF — malware analysis report

Static analysis result for SHA-256 b084b862b17aa5a0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-14 13:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e7b3c6dd9a8457ab6c1d5294ae52924 SHA-1: b128d26c6406ee42fef23e936e313de72b72d1ef SHA-256: b084b862b17aa5a047eae516d280132d8ee8778c0b485c34df0c9d2ec95a45d4
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm strategy. The ClamAV detection and heuristic firings indicate this PDF is likely used for phishing or SEO manipulation. The presence of external URIs and links to compromised CMS uploads suggests an attempt to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier clean score 0.2205

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://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/konazimigokela.pdf In PDF document text
    • http://oldadmin.k12cart.com/media/files/30760439740.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/nilupanenoz.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f3473e0ef3d7b0c1f7952a18ab7ed880/42923873902.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/kifodewagatinimiwaxoguti.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109101624147091.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e00c8eddef---werilefunomovu.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/bupazokijositov.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/faresi.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/wavurojizu.pdfIn PDF document text
    • https://manhremhoangvan.com/wp-content/uploads/files/66615383729.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/69343090005.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/86146562066.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/54408849300.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/bapijetugawusavixisi.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/lmi5fd66b5o1l72j67bg2333br/xepuleb.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/88524877058.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/wiwevugi.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/gasinugiwiluluxesozawotog.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/gosokuxuvenosiwugelidaza.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/zizaxuxetejipi.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/85379171628.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210902055056549.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/12346680254.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/96203034272.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/pemejalitozemuvitudilusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=better+tye+tribbett+lyricsPDF 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_off0000be18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62F 10144 bytes
SHA-256: b090071354b678f8ef425274d6d19291c1766940556f5cf4bb1f90c758890769
font_02_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 17148 bytes
SHA-256: d46f2ba599bbea874e387188a0a58a339835b3893c5d96ed563c9ce787118217