Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da10587b22e4d4c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 22:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2603d2d054cb89445537fce7f2781638 SHA-1: 5d2a1727610adfbdba65f07a9ac920bf2a7450e0 SHA-256: 4da10587b22e4d4c0fe7ae47a97831a8a8d06c3dd8e76dcffe7185e630e47943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The presence of these link farms suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://canxetaianhduc.com/images/file/85604744216.pdf In PDF document text
    • http://cabini.it/userfiles/files/mifosozoziv.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/vibilenepologiwatuduzize.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/81344799349.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/40337663213.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161413879ab6b7---vupujoxudabiseronitowujef.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sizomanivokusajekalapub.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/2111256253.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a966af4a1c1760b391ab2f1f5f5d2f9a/94222893625.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/tifavupatukaw.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1a124811a---91547656772.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109100128353624.pdfIn PDF document text
    • http://wohingltd.com/userfiles/81526622669.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/zobototuva.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/gugulutosifedisetedet.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/futaxapin.pdfIn PDF document text
    • https://tmtteks.com/files/wugulajusivetuki.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a817ba3180---66997673332.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/xevulemabakixo.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/zanebeduzal.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/peruvaxejapefekabemam.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/modilotozekipogojakafusoz.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/sukotugemarib.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/70869393413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=watch+house+of+anubis+season+1+online+freePDF link annotation
    • 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_off0000ddbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBC 10720 bytes
SHA-256: de488e3c5a6fc1fca0bc318eacc5a55eb7f9b7af5baf5e2795f45e7627977ad8
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 18016 bytes
SHA-256: 038c33b632d9510407bb96955b0c184c3a3d6c69455a2f53040d2dc6c2bd925c
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1