Malicious PDF — malware analysis report

Static analysis result for SHA-256 168a244208d1cf47…

MALICIOUS

PDF

80.9 KB Created: 2021-09-13 21:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 285cd5d0b021ca64357051fc1784eb2e SHA-1: aa55b428a29fafe7a8b3d061774f206077ce28de SHA-256: 168a244208d1cf47c2589a1e218655e88e502dd787e2036c22698723d929b1f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://nomylo.ru/uplcv?utm_term=reels+video+downloader+online PDF link annotation
    • http://kepco-group.com/uploaded_files/userfiles/files/80589124691.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/26079010857.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/3605751837.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/92555674120.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/56920214807.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/44047769150.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/88496514596.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/47068832637.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/ruvoxuxubadumonibusilaz.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132588a98f19---93127052307.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/35388907080.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/77983664564.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/25443181875.pdfIn PDF document text
    • http://deforma.it/userfiles/files/taleselod.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3e8a52e1---16838144185.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c4d0bed27---28033559221.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/kuxabovatuvozikopube.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/30586445474.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/refisupazedado.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pemososizesufipo.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/milam.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/7355660317.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/zipasotuvu.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/79469811333.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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 10340 bytes
SHA-256: cb0c231a4745ff4fed80a54245c2a971b30ab5448dfc70205f392deb71f0a29f
font_01_sfnt_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 17836 bytes
SHA-256: fe7fad42df32ed204046da155f390121686c66e246e1f530ebcb62ed107de298
font_02_sfnt_off00011e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1