Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c0459765ae8fb1d…

MALICIOUS

PDF

76.1 KB Created: 2021-07-02 20:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 373b6e7e81b6eb6de6f9335c582e0891 SHA-1: 0798e87ada1984af8d4b0484085610b1d6598de8 SHA-256: 9c0459765ae8fb1d4ab9a7093a210a2bc70bf5cdc6b1d4d12d5e77609fe6a944
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/bgv87eegbmd3q1f4sbjfq51be2/ridelerimonofezogegiw.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8b6040a398fc234002bcb07f4f03e66b/vajulabobegopovalenadimuv.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16080edc939269---kewunasetupazodegizakeja.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s9kvot37fd2ahbc053t4j5185f/86977818507.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/478648c651617df0a9e021074877d1e8/fewufalowerixo.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f52771a49---63445513113.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609065db1498e---pevibudosapu.pdf
    • http://bioident.pl/photos_fck/file/74966821964.pdf
    • http://fusen-es.info/yamituki-n/uploads/files/ketajifefolo.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/a752f90b8ceed16f6b9ec3e304ef4550/zupagonezomivano.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/68159730684.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/vejapafibamexibevik.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c0db6506---lofixix.pdf
    • http://whs1979.net/clients/65916/File/67212014162.pdf
    • https://teyadegitimvideo.com/calisma2/files/uploads/zagivajisenito.pdf
    • https://latework.cz/soubory/movawuki.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f544371ff---11137729191.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/517db56a96281a5d01327c68726d8a77/kenogitemeroru.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/kakizebumonam.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9a5f3650---47277567063.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/9106b8250ae8caa4925c7669715981eb/69362698488.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc720308128---1158471012.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=1800+rmb+to+usd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd77.bin
d37ddc18762ce21e0999de23aeb2c779431c96104cef688a7aa8a92030b1ef46
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD77 10396 bytes
font_01_sfnt_off0000d4fe.bin
25f153bab7c6b441bf0af0828d3e3272340631574bb0ddf5121e9364682dc2c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 1764 bytes
font_02_sfnt_off0000dd53.bin
9e13bc5687d67a8cc5289c990d6b935e58b3948fb8a76f11f2c571d6fdb1ccc5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 19420 bytes
font_03_sfnt_off00010af5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 16792 bytes