Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58bbe0a772ca38c…

MALICIOUS

PDF

73.8 KB Created: 2021-09-24 00:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1470942848fe9e104f1ef7e11b8d2dd5 SHA-1: 533406a2680f4f5c2d1235f2b4dfe24c6e3188af SHA-256: c58bbe0a772ca38cb38e690f408def2c21ce5ac35a1a54d2d7fa0c2696258455
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to act as a link farm, likely to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://damsindia.org/admin/uploads/file/sinekikidira.pdf In PDF document text
    • https://angkoronetour.com/userfiles/file/5050275527.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/kosixev.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9dc69efe1d0129ee2ac14e627c98d3fb/12507625431.pdfIn PDF document text
    • http://accronline.com/userfiles/file/75106564942.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/71905374264.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4f477c5c6030659a1a73481587b56115/zedamivosiba.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/sagawakukukedewuwufeg.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/16254715517.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ac2817492d2964e1e1af6f9c00c365b1/60412640088.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/jirejorebamamegi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141770048515---pozelitolakop.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxowen.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210904_76FC4EEDC603293B.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/69909641738.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/eb8a73e359da9c056135cad6c57e95f2/46931139146.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/24831112458.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/72511587846.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/20241397959.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/72206402981.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/gujelekitetulobupatifosa.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5aopacofbmn6bpo243tt4us5at/jojewinogifasobuliraxofap.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/vavanawadu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/datepolume.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/muwesugideroni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=top+notch+2b+final+examPDF 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_off0000b7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DD 10804 bytes
SHA-256: 049db9945206bbb4fbd2c0470ba5c04d2778ffc31b0ce198304d5cffd33d1388
font_01_sfnt_off0000d06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 18552 bytes
SHA-256: f4134dffb8554024102797f21a9d2539ba5f023afaa60609fa6ddfe0ea8536bd