Malicious PDF — malware analysis report

Static analysis result for SHA-256 d702f5e706c73a0d…

MALICIOUS

PDF

82.4 KB Created: 2021-06-28 03:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 142ad9924efd19f39babbcfd560924ed SHA-1: 04dba95bdcb6a40fbe90b3c7ca7430da323fb898 SHA-256: d702f5e706c73a0dd59184934deea9938173ff41c634db0f37e72e0966caccfb
156 Risk Score

Malware Insights

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

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, presenting numerous URLs that point to compromised websites or disposable domains, likely to lure users into phishing scams or download further malware. The presence of multiple link farm heuristics and compromised CMS upload links strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://irlanc.ru/uplcv?utm_term=digital+electronics+gate+notes PDF link annotation
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/sigenudakoxu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e8d127b81---51761261907.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607ec22925c60---46529538669.pdfIn PDF document text
    • http://healthywithhart.com/res/file/savisikipewimel.pdfIn PDF document text
    • http://chayka-svg.ru/files/60349128749.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/7186dgjoak1qh15vg1nmmlomc7/mizumuwopewefo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/bucue9h0nb6qjtkgb7d9sdqj8k/dadiki.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e75099c7cb---jizade.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/30e3d4424f52883fc042619b1c038055/44016212664.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9e8b4ef8---48804808183.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/96859483190.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430083247901985.pdfIn PDF document text
    • http://bjjiffy.com/upload/23829264548.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a085cf09---koxivepuzemimowuzo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h2ruri7ge8s5611u99sf8lp6pe/64345298430.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/spdu8bs7mv8cgmsggnrs7qihr9/65270828268.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/aad100cd9988bd91ab40cb9a0b272a6e/53626148713.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/wesojuzujilenevugu.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aa8bbad0d---zokobabuvurol.pdfIn PDF document text
    • https://mytopics.it/uploads/file/dokulizinuxadiborokir.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16071f6966c50b---jararafigagomove.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/38163858166.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/61d2f56ab3b4e4cb727ec6d6a787d21a/sitejarosinetufedizag.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfe5404f56---34323455586.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/rexedisiguson.pdfIn PDF document text
    • https://aashianarealty.com/file/59138794791.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/6126536685.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_off0000dcf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF8 10408 bytes
SHA-256: 499a51d2179fd4c128480c6223d4d21e84ac7189ca8b2d6314ef756417fa308c
font_01_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 18104 bytes
SHA-256: fd70bf5e64c3df87f501d2c22e51270cb7ad8bcc84f74490efd909efc1117d30
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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