Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d98c443ebc3e8b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 18:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 761be0cc4039424452af1c7103f34e81 SHA-1: 07bdb724f2ff31b8c7d4ea3fd13ac68605441835 SHA-256: f4d98c443ebc3e8b21551517c792a2026f826573c8b32fc3330de8a186303984
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://oniceh.ru/uplcv?utm_term=cultural+anthropology+haviland+pdf PDF link annotation
    • http://bancasemecanino.com/userfiles/files/4026407619.pdfIn PDF document text
    • https://lesura.net/userfiles/file/fawinidupotetobojozipe.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/65b45bdd5652994765122304855a2813/rilalowotukafesupubukinil.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a93eddf3581---goxukugux.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/57098656541.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/porutipuvitapipa.pdfIn PDF document text
    • http://deforma.it/userfiles/files/97622069659.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b10f6de9567---kodigekofak.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/feguxobopolorusomeno.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/66156174599.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabfea667aa---78406324656.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/31603591247.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/11813768893.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/newobozevasegipolejunur.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/98172703684.pdfIn PDF document text
    • http://simonide.org/userfiles/file/rokut.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f20a3ba5---78598119296.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/9c86e84824804a7c49fcc34580dce957/87143603085.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cac7e6f0680d086d544328ec80eed894/puxona.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160826b5f364ba---79978794498.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/84072453340.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/95595868395.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/21608811137.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/6c640254a81dd68c5b281473e87a3ebe/sojixobuguvidufitasadalo.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/pitexosubinakeri.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/jerudevifizomaxifawukudif.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_off0000ccb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 10788 bytes
SHA-256: b6e4f9422074f0c5db16716a5a2339ac949158369f1e843fec5a3b760fe0a263
font_02_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 17392 bytes
SHA-256: 1bc721694268c06be24cf3be17778b5b502ddd7e035a592d3c913a2a75287a4a

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