Malicious PDF — malware analysis report

Static analysis result for SHA-256 372a9e355d45ad8c…

MALICIOUS

PDF

87.8 KB Created: 2021-08-07 14:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8bbf95044c8de4c21c8e413300d30045 SHA-1: db66d68c2d86fe757ef9460e24a1135ee9652c1c SHA-256: 372a9e355d45ad8c1789db4679f251c9a4a1d57bd7affc1dfc396e83c6fc48d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on such sites, likely for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=apkpure+lulubox+free+fire PDF link annotation
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/48963072b0740c1a9ae50c5bf46ffcb1/37429122089.pdfIn PDF document text
    • http://stonebreaker.at/logudixitako.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a902db1acb---dapixikozomizopifep.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/xopegesejuluvubudibupamaz.pdfIn PDF document text
    • https://coil.hk/upload/files/zobififepena.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/11797910381.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/14626190749.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/35081261896.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c0694b4ac23---66085436590.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/tubinizivuvixafaterag.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/34148097254.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfde777bcd---jasozebu.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8b0dc9eb4d5d571b18764341352e4089/tojijimena.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/94496964867.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/20055338559.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/aa057a1e9f3fcb06d081dfcbad6836d7/13657361186.pdfIn PDF document text
    • http://darienhigh70.com/clients/878490/File/37347055621.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/61051243926.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/af46e47f600a4a28d3f23c912dc6b441/26266258240.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/87113c6cdaf8b796890aad2f6d559f2e/laxejepazikakap.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i6h10pdq26a7b3mcirkik4vog3/58317660622.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607967f7179ac---nokuzo.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/vamibigasuga.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_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 10236 bytes
SHA-256: 62e9b6945abbe8df7af7a6463c0eaeb916fbc0c903844a5d3b604c40527d226e
font_01_sfnt_off00010af4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12306 16924 bytes
SHA-256: 67192f6161cef7db26447113cb3da7679ddc7fc83581c5645d7ff427f659f1ca

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