Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad161460dfe58fb6…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 18:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e78c3b398319f4d61491f9d15a352a42 SHA-1: dd3f80b0ca32e1eda90d5feedd3e3bd89e613c04 SHA-256: ad161460dfe58fb6133279c1b73150b2b96c8c6678a0e4aa1431a2bece940f71
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 functions as a link farm, with numerous URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/a335a8c20a45ca6abb42caf15e2f6967/nizoxowapikakisim.pdf In PDF document text
    • http://4seasonstours.in/userfiles/file/zimovawe.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/movovira.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/tuluxujodebofejen.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/97530051726.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098665058602---zuxoz.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160acd2a7d13aa---bujuta.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/gfbeoj7ope1qk7n4e09uge3rgu/64152828604.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/39063697510.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6ac2e14027b87a488efc2ac2f5118a4/50067329216.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/11203254722.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/46036891292.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/nikupunofirepopegixogo.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b56691a1bcb---jogevezimofukajilusuza.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2q2rvshb8ghu6aniqi59i6bdsl/76630534591.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/7fa0cc07681bc45e85e72f78ff48636f/fezolanutuxejofexa.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/33299444991.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/eageqtbvfl0e7251hd9on5l33k/mosigefepaboromaru.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b6ab7c96---jofokagadam.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a1f591eabf7f857fce2e859b923d6cee/87384244191.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f6ff7ae18---sorokesebuvuxitoxobabokor.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf31f44be0---96771163977.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/239adc5154056ecb147df011d7252f32/33952080406.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/63466344170.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d98e1250f2---zinewugaziwofelorapafeb.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/25832139539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bronsted+acid+catalysisPDF link annotation
    • 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_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 10528 bytes
SHA-256: 5ea8e35635381603a1ca537d030d61f645d274b1275e85a85cfff4ce60c1d8ab
font_01_sfnt_off0000fd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 18152 bytes
SHA-256: 498675bf1fcb1c38bcc46b572d3008bf858c2ddb65370fbb718b532912985d92