Malicious PDF — malware analysis report

Static analysis result for SHA-256 977c2f73f2c561e5…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 22:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: caeaa1b1ff4b1982bd88c4ec3e11b89c SHA-1: 1a787f88ea8e23375ad7defa899c14af4a249d3e SHA-256: 977c2f73f2c561e50df6f0b37bf753c5e8d9fa1e6f23f0f747a1066630651d91
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for phishing and malware delivery. The JavaScript likely attempts to redirect users to external sites, many of which are hosted on compromised or disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 7

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.ecostroyservis.ru/File/61643132310.pdf In PDF document text
    • http://hawaiianhunareiki.it/file/16812352902.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/48136520696.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/5441371377.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/80301304656.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/wipofidetiwojex.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/vagajovupefipuloraxu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/j3elc9teld76c0lgrgqh22nnc0/67771068658.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/gokenine.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r1h6lgsr2ui4sa329nk3mi7d39/pevebimanivubis.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/175061236130e65e14797.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/91246629204.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/33924140951.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/it3gdemcdcphbqqa1n66lfj1lc/87789875112.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/divelasuramig.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/bofuvup.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2e4420818---turatinizabifegax.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/gawiwipodudixerop.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/15096574703.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/62232855.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/jivararepetixanotakijasex.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/fc19f3e25493e776fe18c5043412c965/67046947259.pdfIn PDF document text
    • https://agrando.cz/files/file/73064326458.pdfIn PDF document text
    • https://pecsikult.hu/files/file/54495395751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fear+the+walking+dead+3+torrentPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/18967272493.pdfIn PDF document text
    • 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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 10684 bytes
SHA-256: 101d0a53ace1bd5f8375f22ae69f373be8c7255ea4da7ee4dbf3414c7b3a7b72
font_01_sfnt_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1