Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86e1bc3f5f577e6…

MALICIOUS

PDF

74.9 KB Created: 2021-07-15 18:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1704433aa3ca2ea7bd63a72460354670 SHA-1: ca2ab91cd7e4d9a1a99aeb5b938131133db21d40 SHA-256: b86e1bc3f5f577e6f18a4723c229f8606f26bec65dd4fc1183d8ebb0eaf176a6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5356

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.
  • 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 https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/faeidgbuto9f959fs5b27qjahq/wofozidekuposubutakamalaf.pdf In PDF document text
    • http://albino-pitti.com/pub_img/file/ponuduf.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/39706608634.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q7g9l7sq7iot8d6oiaijov1t23/tunaruguwisiveze.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c177f742b32---80654550468.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/gelutudemuvusezoxov.pdfIn PDF document text
    • http://bjjiffy.com/upload/buwobivajukedobimozir.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/be0c7f455aac0e2a20adb84121e77a2d/31828115357.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607441b5e863f---82431849295.pdfIn PDF document text
    • http://klefmarken.se/upload/file/livup.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/9043562157.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/90345835468.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/62153918664.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d3943797bdba746fdb10b816f3869164/nuwil.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa9edb1ad---26100144118.pdfIn PDF document text
    • http://stroi-sistema.ru/img/wesagigupupepoxonal.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c72fc36648b---64633407356.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5dadf22c3---goxawukujaxepijafenikizab.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/sesudavozepogaruluririwes.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/naduwowaweri.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/fejuredodujotivinas.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/13554268427.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/5de9ea9e75cb37e1adc729734b5e54fa/vubufe.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609648dac5017---zolefis.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/lugilajof.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/h66rru2j2qe94npii1tb1ff7tk/gesoletufujabulaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=south+lakewood+elementaryPDF 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_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 18020 bytes
SHA-256: 1fba8feccf1902ada1c0159c2a7c5251b5be0c2e900b4dab20c7ae1ecd451184
font_01_sfnt_off0000faed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAED 10720 bytes
SHA-256: 6c02f12f23013482cd2974d13b26207d2c4eb4dab83dec69a1bae1ba49a96bcd
font_02_sfnt_off00011374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11374 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8