Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cafe51332482d4…

MALICIOUS

PDF

63.7 KB Created: 2021-09-25 13:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6050bfafd52f6bb92c96f606975f2e7 SHA-1: a3fd0d29bab7442cdbf0f3f3dfd8896f01704ed9 SHA-256: 78cafe51332482d4af3a675a80ee0420435f555120b9f756cef920eba867eab8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

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 https://cafesca.mx/ckfinder/userfiles/files/76850840672.pdf In PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/fejuxodajusaje.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/14267693323.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a0fcad515---42088886416.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109032110132885.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01c0ab056---vomepegos.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16145155eea163---43947101279.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092008014663.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202191200297892.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/50402423754.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/bolukigup.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/50856452439.pdfIn PDF document text
    • http://jump360.co/upload/files/20210915143739.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161330f8569504---welokiwabewizikesolovuteb.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/votiwixuvamunelaxanu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462427ab2c6---jiwebifubavarowiduti.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/87953453947.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/budusulemo.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/56397709843.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/17537096394.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/53794154597.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630469689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=newest+movies+hd+5.9+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 10996 bytes
SHA-256: 66e8c02abfe739a9bfb5564c7eb18c46415999abe9555a6605eff575be75d1ab
font_01_sfnt_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 18332 bytes
SHA-256: bb4153e771db1f7bb679b05bde683fe19dc9c2085db2ab11c32fe428758df9e3

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