Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fa0ff6fabd9b8d2…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 06:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be51b5adb9e0e9c873b1647d77870481 SHA-1: 58dfbf4a3ea4cc0ea5a022bf8b7bd777812be273 SHA-256: 7fa0ff6fabd9b8d2fbec824303ed24ce5105e07517a31d3f215dc121b459a11e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF 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' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=micelle+formation+pdf PDF link annotation
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f93691e1ae3---zesukame.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/xeramilemoxedenel.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/1831294306.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/15235541060.pdfIn PDF document text
    • http://snsi.jp/image/news_file/nonofojezi.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///waremaxujeraxenumudo.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/vawifosawedifugasi.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/85826813146.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16105b47ab07a3---19810574080.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/76348753098.pdfIn PDF document text
    • http://deltools.com/userfiles/file/ruguwetofaselid.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/biwugibuga.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d8e98a3b8---45178387696.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/08dc02c0de418af2b4b075ff14183562/kebimuwizum.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/mijarevuzaloxadojozodawi.pdfIn PDF document text
    • http://feminella.ro/upload/fck/buliveguxituzebe.pdfIn PDF document text
    • http://kurpinar.com/img/userfiles/files/gimatisevobiti.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/jadatavajenemomovilowim.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609423551d206---43187982020.pdfIn PDF document text
    • https://aspirans.com/files/file/tabugugolavev.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0505a4db6---ligovimokibapapisor.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/94926730617.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_off0000d576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD576 10608 bytes
SHA-256: 3676656f3a9aed07a53e5433cdc0ebbf882b2724ee6ae9c5709bb2970d7eb955
font_01_sfnt_off0000eda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA3 17432 bytes
SHA-256: bee41d967c45abf203bc4914e0177fb1d3de798ba3f1788f1d0027d6d49350e2
font_02_sfnt_off00011abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1