Malicious PDF — malware analysis report

Static analysis result for SHA-256 94647b5101d78655…

MALICIOUS

PDF

99.3 KB Created: 2021-09-19 14:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d1e26ed2704117b723398b653edcd70 SHA-1: ac5829322cbfab0e934d1d3d15fb87b530f494d7 SHA-256: 94647b5101d786557462c4bdadce5bc3476c8f81a41540493e07bd7ac5596272
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://millecolori.it/images/file/56840026261.pdf In PDF document text
    • http://logopeda-empatia.pl/content/file/jogad.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/47077275261.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/lisonor.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/wojowujemibefezeteruka.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/puxififebegezivefek.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/jogigedemunigixanaxox.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2fe6e99beb91377d51a4dcdd02a3bace/tejujidudifebokomij.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5142ac805---96484081098.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/jajifilubol.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/96072275953.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/65281926702.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/lazojaze.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210905232136.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/99009098737.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/82552633791.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/temirevejusatekiviwulefu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4fa10d0fef022783af881592e3464647/tukonujebowedalix.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/napisixewituwem.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/97128371215.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/56565365613.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/sujixaxinaderilofopobun.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/nasusilarevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+add+picture+in+instagram+story+androidPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/65224363583.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/mubezilojigazusipeno.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 18020 bytes
SHA-256: 8cd723597ae5b38e95467602c87f696b0a9c939459836c79db20cd343288b657
font_01_sfnt_off00014ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCF 11100 bytes
SHA-256: 690f254a5c3b468169d9ae1a75b3a527502717fba5e00ac66ff2daabf8f2b62b
font_02_sfnt_off00016690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1