Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c09da913644afb…

MALICIOUS

PDF

74.4 KB Created: 2021-10-02 20:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1be135cd0278da32a2c698559f45500a SHA-1: 741caace69d82a365d4d70d4bce46f796f8aea09 SHA-256: a0c09da913644afbae6e03c3eee797360aa3ffba87c4bb984cd5055187d497a4
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several heuristics indicate that these links are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://pistant.ru/uplcv?utm_term=prancing+meaning+in+tamil PDF link annotation
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/37669763788.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/10545705205.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/77109112647.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16150f4650a9d0---95800673311.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/xotulewuwow.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/tavaj.pdfIn PDF document text
    • http://klpa.net/userData/board/file/wumozexupomekanenuki.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/86030808315.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161374ee33cf66---36438574235.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/kuzide.pdfIn PDF document text
    • https://kvzriu.org/images/file/xigifozurajemirep.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/kexadaxodunigowoxinuxakuj.pdfIn PDF document text
    • http://foxadv.net/file/wekafurarimimedalinimo.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/voponi.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/bitusesikiboj.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/83855762657.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/zewuzuvasevuminorupizaza.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/30f332d5ae52dcfec4c5d243e47b2bf6/zeboragagokeman.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/bikupijagodexarupodej.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/soxuvijoburufolesafiruwet.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210912050234944.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/29549374416.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/2337737192.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/jekujesetolutaxu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/37bfdd6e5c514cd4c04d27b01c90441b/moxufukixirova.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/xetefulenuke.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161338e39dcfa4---29718349527.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_off0000b776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB776 10284 bytes
SHA-256: 2808d5992632451e7b30e5759305ff11d7f93e84bb5368fbdf75605f77897883
font_01_sfnt_off0000ce88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE88 20724 bytes
SHA-256: 0347adf556b5a73aff4e909d1b06c37ff7387db59244ebe95438b1759c6555c5
font_02_sfnt_off00010459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10459 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1