Malicious PDF — malware analysis report

Static analysis result for SHA-256 03ca271ff363e531…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 05:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f204824e9c8affbc2779d35a9fd6b74d SHA-1: c5fb43d9c0d3cb8877d42f8c8acd0bef76f883b9 SHA-256: 03ca271ff363e531bba6f121a044be3b48556fc6d5219c0e3ad8c9aa3a9b5383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to websites that appear to be compromised CMS uploads, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is designed to facilitate malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://rracc.com/file_media/file_image/file/pakirezikived.pdf
    • http://www.childofafrica.org/media/userfiles/file/siwevatefimivokagel.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f236c32f8---sasotibogageponixazuguger.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c220ed906---tozudupavimanogonoxi.pdf
    • http://al-bandak.com/userfiles/file/fogutibezijosunuxa.pdf
    • http://alfavit.tv/userfiles/file/naradewera.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kdjp05c1bs7e8m0oefkk9esmhb/89520560440.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161087140d993f---59288815595.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a421879ba02---wivafuporafopasa.pdf
    • https://www.karelo.com/uploads/File/kadop.pdf
    • https://marblobath.com/app/webroot/img/files/55547088279.pdf
    • https://prtl.pl/userfiles/file/25006539679.pdf
    • http://www.rify.us/cms-uploads/files/vasipajaro.pdf
    • https://wct.goldcrownresort.com/magazine_files/files/puzabugutiwebokilo.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/37942772226.pdf
    • https://emenu.hu/editor_up/vabodasopelunip.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cpjhibj6rtv57i5rl0eb7i7h64/gazusozalavivinizukumep.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/bobv3o6ogpt50cio2jp4g8e0m5/xituvovowezavula.pdf
    • https://cambodiadriverservice.com/userfiles/file/24508007603.pdf
    • http://lindseyderence.com/userfiles/files/78292564246.pdf
    • http://vencedor.coop/images/admin/file/44868607215.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/pepubaz.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4650630b---zumiwetitenojidimuzuzemib.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9nbmqb3doau1mb7i4uuda7bfc0/18153083148.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=afrikaans+language+rules+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca13.bin
4e7c3b41fb4abbdbeb35dcbf369bdaf9340ddd66ead95759e890e6e32e58948e
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA13 17932 bytes
font_01_sfnt_off0000f87a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 16792 bytes
font_02_sfnt_off00011091.bin
ac967b16ce6124ce18ce51d52d9d76e8dd05410d7b2d80cf7f7c75417ab98eee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11091 10628 bytes