Malicious PDF — malware analysis report

Static analysis result for SHA-256 a755c74771a95a23…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 21:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: edba2ba4614e52c37605ef552c9d50a2 SHA-1: 1d557cb71b3cfb0e86a07298a3936ab8191856df SHA-256: a755c74771a95a23e873fc98bc0d744135cb7f4c79ed1df573d8957c762c9374
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The presence of these links, combined with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, strongly indicates the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=network+security+administrator+pdf PDF link annotation
    • http://portalcom-b2b.es/img/user///file/_0028077001620219532.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/sujosaxapifetava.pdfIn PDF document text
    • https://tsegypt.com/file/tudebazeborunulejupitadi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/17540128135.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b60d7141116---konamumejo.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9cd47e8---rozakikasunomekel.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/34953558799.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pv4ebsln56vban7oggfsc69o5d/68465238611.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/83718139fddf8d02a3f4eaa173d818ad/nitotobowakubepepeduzavug.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1fac633c26dd0e1c803d78a2cf359dc5/dorinamozewoja.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/95203253917.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/xonetik.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/miwuzetulilozuroti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a797bf36e63---xupavolora.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/fumibewezazasewukenarox.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b71caba28a13f853121eb28568bc6610/68197884753.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/velowuwedalowov.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/34006537298.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97254636897.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/94471287673.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/33c316a87de470aa6f9fb449f7e89598/81818387229.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/83459691640.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_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 11104 bytes
SHA-256: c630de8bc903dc2a1b60bc5e1d99cd8f0189cb4bbea9230becda3c9b74832275
font_02_sfnt_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 17604 bytes
SHA-256: 4cd52ecb76aed31a2c2453492fce3f6c9604e3bbe22f8a7df3c9d2a57f0ed32b

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