Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1934c5b3d9c3a4…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 21:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fefcba3a764a64d475081a6543af3c98 SHA-1: bef6e17aafa73c76d3752fcb7e47c12101824f52 SHA-256: df1934c5b3d9c3a439c93553c21f3ee613c10140eda32f2a33269d59ac2d546f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7380

Heuristics 6

  • 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
  • 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 http://erodiertechnik-wenzel.de/userfiles/file/95390612712.pdf In PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/tolekipivameju.pdfIn PDF document text
    • http://rococosofa.com/files/files/xazidarile.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/24851695004.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e95e8826ad6982ceea348a449972b0d0/16539944650.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e5bbc7869---dakiboloxotafikebat.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d390bcb640---69535935959.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/52040229249.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/kalikimudulukade.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109100946412747.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/18920549090.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/nivizazibejifomigodomali.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/zobalejajerev.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/54092898481.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lemibedat.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/40911906409.pdfIn PDF document text
    • http://texmet.pl/userimages/file/lesume.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65165284866.pdfIn PDF document text
    • https://sadex.pl/fck/file/rusavonuxebuwunetuvis.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6248f7af3a8e61bca1793172c93f10cd/ritesosadaxa.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/37821216100.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/duzubunulotatuzumino.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109020028484517.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/totunurowezogudaveweguj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=thank+you+for+cross+lord+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_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 19964 bytes
SHA-256: 8c12d9100cb46dfb4828a34668ca2af44435575d107235ffdbd4bde791a42bcd
font_02_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 10612 bytes
SHA-256: 333ad8feb565cffb08a4a2d5af657bd6c7ebc1f3edcee5047f6c2fcb05900a7e