Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8620acc75eebbb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 16:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 60dec2536da4e395485115890e029117 SHA-1: 238327e6a2c9c8718186d630770e9ac08836f0b9 SHA-256: ee8620acc75eebbb85461d5f33503bdce9d4111dcf857c49b6f1473f33cce237
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a strong likelihood of this document being used as a link farm to distribute phishing or malicious content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=hangzhou+metro+map+pdf PDF link annotation
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/radumiwalulubodevewunaki.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/51609803335.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/30200168802.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7c3717d115---tumumeli.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ee46b5a2cd0---89765417873.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/lifezatur.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/59116444617.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/594a4ab5d6cdaa125f6c167ac5171f56/bigosopawavalozomasas.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc628bd907---99280516565.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/41281152237.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/50313886055.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/vuxutozebojewopuvatuko.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/26660176519.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/87442198292.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/lodemijela.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/zezajigaf.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b81109aac9---15725891781.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/tusitog.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077187b6534d---gapubinajurid.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/davisexazuzinobelidudaji.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077de6dcd003---xubakopobudiguz.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/1af659b14b000605421b7a00d7e0935e/8532265050.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/2dac8c2a069fc2158e82201fc002e1ab/jejajuninejedalul.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/7424492274.pdfIn PDF document text
    • http://seritour.com/rsm/files/85817914475.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_off0000d157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD157 22324 bytes
SHA-256: 101cca2a45acda64e10a3295695d6c387d10097e9ad77c2100d788d049daa889
font_01_sfnt_off00010b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B51 10788 bytes
SHA-256: cbaa295a54e5b6c07d2ac3503f93d9e05b29ff2115ff116d031d4b965c621625
font_02_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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