Malicious PDF — malware analysis report

Static analysis result for SHA-256 686d4bf63b8bad88…

MALICIOUS

PDF

77.0 KB Created: 2021-09-16 05:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f6cbb89aac30cd82924224555459a087 SHA-1: 78e9de16448e7f1d14850c3db321d513e311cddd SHA-256: 686d4bf63b8bad88cc474025d03c95ab14a396befcba390614c3a7165a0b0172
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to further malicious content or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6556

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.
  • 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
  • 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://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/63624024713.pdf In PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/38977375934.pdfIn PDF document text
    • http://napiarsaigh.com/images/redevabebanobixanati.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/76623328814.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/disugurojerumewetobuwi.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/78814239846.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906230600.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/fesefixuxopozitoxaz.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/72616221892.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161393a78e127d---7664128069.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/15166641259.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77d3242a1---60811636161.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/96249140034.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210909054731.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/podavupoliwire.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///96104383417.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/womozuzabuxavula.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132b200c590a---mibekajudulerowujo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hnv3poi4v4siphml00cd1avfvh/gefovitemukofoxonanuruwe.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/fe7ebc4c1c587faeca0fad4b47078c61/nejawepiveme.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/674b24c0482c1d61add81bb20c545b9b/93791609512.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/ripadugak.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/69524223783.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/90288591038.pdfIn PDF document text
    • https://ms01bet.com/contents/files/9613559939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=amazon+for+android+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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17C 16816 bytes
SHA-256: 5b0119f9cf1581b3db4119c2e38c09a0e8a8f23a6b427df682d19290df644dfe
font_02_sfnt_off00011d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5B 10348 bytes
SHA-256: 2215e64d4e1373f25d10cea7e54a07ccd3166d121c3247cc14848f5edaec8ffc