Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b2d8f173f6a11d2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-27 19:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2415cf28f68013b9cf88f7bfee9283e9 SHA-1: fb3f44a07e0662c96dcbdb6274bec898b049e898 SHA-256: 5b2d8f173f6a11d27b332806733d3b6c68b1226c8ea87d928703563dc7150c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The document contains a link farm with numerous URLs, many hosted on potentially compromised or disposable domains, designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://fertilizerproductionprocess.com/d/files/pawuboburimolasubewana.pdf In PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/jrpad32ka27m8vvr62oqm0atlq/fujalabavevomov.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/18148188820.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/35831258946.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b039251b5d---52487136313.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/runobelifapusonono.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/pojuxisutotowuvix.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/latunukasexolelix.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/db2fec687e0837342f2f8424f7a08e87/muzemon.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210920003512.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/31082379351.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/43654754773.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/86810384437.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/riwokegebijekiputen.pdfIn PDF document text
    • http://julianina.de/upload/file/fusewuviniga.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/kafeboramebosagipivimi.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109152348242377.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/dofevun.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/zizejetiloxes.pdfIn PDF document text
    • http://cabini.it/userfiles/files/59617205271.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/nimula.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/83716763400.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/bukodutomuwiwom.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/77160389755.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/32941178276.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210924071034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=otg+see+apk+downloadPDF 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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD49 16448 bytes
SHA-256: e150396a0dda6ff06b3e87619e1cabc0b5c7b43a949ea0d6c96cb3fa4ce7c045
font_02_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 10576 bytes
SHA-256: 40265dee0088cb1de38efa98d377727bee44c29137b6514038b87d1d366704e9

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