Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b9e8d34f2261e0…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 00:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a03f4c1bdd97a67b80082d93b0282fc3 SHA-1: c75d5e0dd962c2b346cda97d677e9f889e8cb12b SHA-256: 73b9e8d34f2261e022f034f91607793bd753062c7c470a7fa50c2a6e8a97e1d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

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 https://garglob.ru/uplcv?utm_term=iron+man+helmet+blueprint+pdf PDF link annotation
    • https://alansglobalservices.com/ckfinder/userfiles/files/vajuzetab.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/20589675707.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/xukod.pdfIn PDF document text
    • http://cjatkinson.com/userimages/20148291931.pdfIn PDF document text
    • https://eslms.com/userfiles/file/lefusorefo.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a9f645d84---selebizupuf.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/wiloromubusuriduxe.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/66493900151.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/66123619671.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a76ca686d6---pazokura.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/96876249127.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361b92a9e15---guwalovogapowaxogaju.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/535531018.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cbe542d2e---43770011154.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/gavubibejaxewuruzenese.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcad71e92b---rozovikako.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/mimiwijutuxip.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/pijuguwifaf.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/6795243381.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/52aa5c0546f4b7d1746dd0045ae31542/75869542493.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tg7nhnqt5pcplvhss9ct08noea/ridujinuduvofubuvakidix.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/bewigakinigenupawopat.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/63933164015.pdfIn PDF document text
    • https://kuepancong.com/contents/files/55211771571.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fab3053ef32---jejarirupaxibodovu.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_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 17808 bytes
SHA-256: 5d394a765b2b879662bda6c5837f0591d9f377cb2acb5950125aac03c6947e7f
font_01_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 10788 bytes
SHA-256: 5e71e0a524950f951123b6f95711340a19e355dc2c2367923e60d243ba428521

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