Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b4011a0eee9936…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 12:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f316277dbdc3ace0633d8c8e644b4c0b SHA-1: ddf697a4586ba4fb537900d96d7a8b411a6f931f SHA-256: 10b4011a0eee9936397fd28f192a7937445838ac59b01537274a1714fa252a88
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which are hosted on compromised CMS upload storage or appear to be part of a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

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 http://www.bash.cl/media/file/64983340183.pdf In PDF document text
    • http://mega.kz/media/upload/files/roxotofavaxiwi.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/vopekifabedo.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d8505c6e5bcd200d1aa52fb35cf1839f/26290722436.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/2974633059.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/vejenetigi.pdfIn PDF document text
    • https://anakmeong.com/contents/files/91627612962.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/zigedotu.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/32096045894.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f6dc98a190325770b63245683d2cbb7a/gomebijefubesipomo.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109022035292783.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/romol.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/kebesezavewulupisepi.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/kuzosuxukisorabonorelije.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f5d20d66---36867415532.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/povijomulevo.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/ludok.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gigesetagezura.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/40443099782.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/67615063624.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/96997195267.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/63134176755.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b327debd72---97110770422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+500+free+v+bucksPDF 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_off0000d975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD975 18976 bytes
SHA-256: ff805c5fce71896b031d12ebde9d3a9d5a62a0b9e550d13b525cd99389e954a1
font_01_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 10840 bytes
SHA-256: 970696f5615f4e82923337de830610c8979c78a6ca918b025242a6eb107e9456

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