Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c7a1380bba1794…

MALICIOUS

PDF

90.1 KB Created: 2021-08-13 22:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 62f9d3ddf951b1fd5a195beda0a02f8d SHA-1: f4bf506c10b4468a67a1109a08ec768b6a926898 SHA-256: 84c7a1380bba1794ed8c25aeb8a1620a9d770563f91cc4c6b16310851dd5fb8f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d13c17116---96770637572.pdf In PDF document text
    • http://deltools.com/userfiles/file/89044093279.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a875367d---ponolonetelutamewi.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/zukosenomeli.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/lodotiwekawemasenodiwetop.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/penoxukejumodake.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15cb3086c---99573034242.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/69031027263.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/9a560f34d6fcc24d7d5363a78a59e17b/xezefodofufiwekopajur.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/59848442199.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/13012652192.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/23910564621.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e216ff4c9f612972d1b78c14cfda5cc5/jofuv.pdfIn PDF document text
    • https://advik.net/userfiles/file/linova.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d3c6101c334298d21cb9b5ff176c799f/20692563264.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/gurolij.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7888e64f---ledotogujurikemak.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3fd1d17cd655b259047b5b007cb28b9/23335000100.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c103b93e9---56212736753.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16085cb20d522a---23902649153.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/326647209.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4dc9e31d3f643a5581c6bec843223161/61718986919.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/68a174d853242ca92abed64426d1e591/wuzunudefofuripudoxij.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/30329144146.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/duzinesumotavemabup.pdfIn PDF document text
    • http://bendhigh1970.com/clients/1/10/106e6567aa8bd3cecf4080670b11bd10/File/jisipifagasivubutifuwigu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f62a98490---52177206342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+use+opalescence+whiteningPDF 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_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 10728 bytes
SHA-256: 803c403045eb604792cab68ac34b7eb88dad2b53493ba5f526c6b2ffe58b25bb
font_01_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5B 17196 bytes
SHA-256: a65900a2379d6e9233fd933acc4864c2e7045f2c293e2c372d011359dc21560e