Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ca4e37bf015f2a…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 10:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 28f68228bbcb979bb8713507c08709fd SHA-1: 1ebadc212d4055aa18a161bc1306acdd480eeab8 SHA-256: 66ca4e37bf015f2a4556db96a187b69ed3fc11c9d4ceb2c576bd1a9a59bf46ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious destinations. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://pistant.ru/uplcv?utm_term=better+way+to+say+to+whom+it+may+concern PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af48b2c0c8f---75934357492.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e5237765b06f8d6595bb765012116dba/rilamofi.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/tofipegire.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3eea6e640---70236831186.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9f20913a5953fbe12f68cdb21f29a915/60914603041.pdfIn PDF document text
    • http://abpaluso.com/upload/file/sokafoma.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/jerijuvotisoz.pdfIn PDF document text
    • https://masukpt1.com/contents//files/rifosum.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1622818150.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/nijobopotigiparirew.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc46235b75---31034903941.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c115a12b5de---lofasidekepase.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/nkcer43lve218t3l2g36a5bhld/96377584304.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/saxofi.pdfIn PDF document text
    • http://boxethai38.com/upload/file/64891228736.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/27313401009.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2274aa855c---26241882459.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c01a6c0e06db6d9fa3babd22f3524347/92803866607.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/muponi.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/32391799671.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c2628f52---nuxivedilinemijasekumu.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/44340080912.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/gpkaqtuvh7hjcjimcdo2669d72/60872307525.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_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 10704 bytes
SHA-256: fab61a097ff6339bf32f500dafd140d91888fa33a4447a695e58ef1cecd036e1
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CB 17884 bytes
SHA-256: fb112dd59cec80e7b961781610a7afc60af3981c0d980ab0526f4d3a635c1ffc

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