Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da50f27e6cd23bf…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 03:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d6c5fe588d46fc8d0d5766dcafab048e SHA-1: b7eedcc29be4eab6af0405c0719b4d51e560a52f SHA-256: 7da50f27e6cd23bf599f97e919ac752fbe01f3a5ddca8b2aacd6876627c79e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nomylo.ru/uplcv?utm_term=ninja+ludo+apk PDF link annotation
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/92248778975.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/pedap.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/ludusexotijogekomo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133653361c84---16165999808.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/17441044853.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/71331850052.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/66461123752.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/7998597440.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/2066098432.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410df0b23f3---wopusuxugolisebenomelefe.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/xafafumomatelel.pdfIn PDF document text
    • http://www.polni.si/Images/files/91065924633.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/93139947349.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7967c2f4f---53903223663.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/92042017772.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/71326308404.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/86969958814.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/givoduki.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/opc4uca91b9m9hu3t43npvlgi6/robufasogelide.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gur4if3pnb2sqqdlhkn6v445p3/nibepavexapebutizibi.pdfIn PDF document text
    • https://scalping.ir/data/files/file/lemitatiniwafogej.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2cd5ae50b---desumafaxodebulej.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161318a6111b89---nokavuzigipujokipofosawuf.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_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 17692 bytes
SHA-256: 1512224359d91bb53685dfee4327f7871be70bd516154bb03a9d26fd0400eb36
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 10184 bytes
SHA-256: 28596db25a9e504593ae837642ccb2e98cb46a4208d643fb776aa58b05002cce
font_02_sfnt_off00011783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1