Malicious PDF — malware analysis report

Static analysis result for SHA-256 07438c763e98c10e…

MALICIOUS

PDF

105.9 KB Created: 2021-09-07 15:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94898751da639828457ae19e7190a71a SHA-1: 669c1b88035c79bbe42edb23de9a17524de5ed2e SHA-256: 07438c763e98c10e5f7a6bcb4e49e0c27e66149b531a06023355aacf5e0ef21f
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. The file contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phishing lures. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://allytemp.ru/uplcv?utm_term=bearing+capacity+of+soil+test+pdf PDF link annotation
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c02962e03---bokedun.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b2673fc4---gasusame.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/82504608319.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/5gn267jfs8q9g5jeqqdoq06pu7/64878612067.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/zatolimafoketibabi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210506063844847856199.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160fa004a36c56---89723336503.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/27199311759.pdfIn PDF document text
    • http://mamitobe.ru/files/file/4486657273.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda741d26f---59108390220.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/sazofa.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/mevatexero.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/napof.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/71ftl2k00mkc72nh6dlr2i2rv2/fusodal.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099fd60090c2---kawit.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160779d9f21e29---80923229030.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/6047049289.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/54k0j2e4ajc8d2sku7j9bgnd34/83788311095.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/59910306989.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e3d9dc94d780532e39c60e8dba2ec52d/95797897725.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/bt9vpq8og39tllap6fqvqg1rkt/bedeketiv.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3cfab4284---15315050890.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/65291764303.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/kugcn6im0499dqpt4fjehiv8k2/toxasatesedopubafon.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/df979c813003bc633ddc537a8f3f45f4/dokiv.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/65821238070.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_off000131b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000149c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C8 20536 bytes
SHA-256: 72bef604cf92b9ecaeba24b2dd917c32b4cffd8ddf099928f8ce3e53c6ca9956
font_02_sfnt_off00018026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18026 10964 bytes
SHA-256: 01e44f6395f3b2a07cff597f56119e1254573ace3e05fc8f9cd7f883eff06be7

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