Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5633234df16bc0…

MALICIOUS

PDF

100.6 KB Created: 2021-06-10 10:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8604c3c066ce914a0cb6f5cf1e82fbd9 SHA-1: c02a6d23fb97f75a82e0c85f893104a9d4aab228 SHA-256: 2d5633234df16bc0a908a3ad071103b09016e6541fa036ec49d184d7ec0d7c99
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a campaign aiming to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://catamma.ru/uplcv?utm_term=manual+codigos+de+control+universal+rca+para+tv PDF link annotation
    • http://abogarestudio.com/userfiles/file/nuzizepufagotewaxetef.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160909cfa767e0---fuzexevakupux.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/lopotijokegivunoxetubiref.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/64570951186.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b4530343---26859981993.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c36222d5---74184831014.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/54404596817.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file/%5C/jufutajufisekufavexategu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/pesiwitigawagiko.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/tnr2c9r38g90d56vu2d6corab1/zoruvepinojunokageg.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb435d068d---79255191540.pdfIn PDF document text
    • http://greenbrier101.com/userimages/xafoval.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072adc42e904---4067192937.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/o3sh27facak0bfoaq0528u15i5/dovenegesuxadumufekopedag.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/69385304967.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CD 6440 bytes
SHA-256: 705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf
font_01_sfnt_off000122c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C1 5304 bytes
SHA-256: 7ff5df023814e2c3e50b0dde3fef05ad555fbc32c1846c055d6a8349b97dd51b
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 19464 bytes
SHA-256: 0db6cbf9ae295c7d5597519581302b5bfb9683361570739e75c90afe3eb511f4
font_03_sfnt_off00016d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D69 16124 bytes
SHA-256: 018d3a4cbde5a2f68fe956ffb1ae128e388ea23f4e250318496bd7275bbd883f

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