Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e0f99c502b9bef…

MALICIOUS

PDF

92.4 KB Created: 2021-08-18 16:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fab144d9172d01203f79686376966a09 SHA-1: 29bcaffa9fa572db9ac563456a8575a89f31c4f5 SHA-256: 26e0f99c502b9bef60eeb3cb89caa921b640cddf96ca7fd0f5f205ee355894b0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://otvorene-srdce.sk/userfiles/file/zimixetipodoz.pdf In PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090da96839e0---bujimepokipanu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9d6a5e9b0---91926910993.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/55567671272.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/kajavoronovezajogigiketos.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/62f12eed5f497c00607a225a4ba0d003/wunuditulexadatorenaxo.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/ruzabuselite.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/45214742745.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/popunarabok.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/de53ea258a4f2b1fe85760e59a7e067a/8226121494.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3133f03902bfc2d1c09ec1d3fa093951/nubopufosula.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/14573647834.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5l5demhsj35bslpcgv413j9il7/fimukotamefus.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c19924b1c---litotawivo.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/26139928229.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c1f0c68c---16314632571.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607049830d5c5---menuv.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/savobe.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/aa26ff6a49cca7dd0cf05feb81ee20ba/sabamigagarijovezoma.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/81892609010.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/64876479028.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pcncj4j78ocu3ior15blkriuk4/xozono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+advanced+avatar+editor+robloxPDF link annotation
    • 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_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 17088 bytes
SHA-256: d37881959b1ae1c2c649206e72e981d498b8d035ae4332fd17347805149e6e24
font_01_sfnt_off000131d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F0 10848 bytes
SHA-256: ad57676d9c30487a6adadb526268dc9b74a7b853883d8e35b121fe95dfc9f543

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