Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4a50ffbc282a64…

MALICIOUS

PDF

94.7 KB Created: 2021-07-01 12:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b6294cd4271ca82f6fe38fdeaa27ab96 SHA-1: 43bb00a6886316c2897fd49b5e0a5a1a7473768e SHA-256: aa4a50ffbc282a6423969f47be88c21750cbe8f5b4e12349c33e3cb5ad36b6d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which appear to be hosted on disposable domains or compromised CMS installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://crewmak.ru/uplcv?utm_term=beluga+whale+molting PDF link annotation
    • http://mashtalkandil.com/userfiles/file/66014513736.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/fugapobulusenixamepitavir.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/87bf8c47cfb57a1becbb7acc1d61e21f/24779981194.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/jovesilusopuxiriv.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/popanul.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f5465269a96b07e8bbd54fdfd72591c/7961066016.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089773fe3dfc---datadejatojamiwumotoxifax.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d703dee7eee77dfc2f9a7e10295076dd/64323991027.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/gilixisajefimopotonujun.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/68983941009.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/91728810395.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c717cb9cef454e1cf5aae311c704b4ea/73188688817.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/20981622630.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/94003938432.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/8726100840.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ac1ec8527---65298432081.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/5ma1mh8bm3r4vemvetcqas8rsf/sarutewasuzawuniragep.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/9592e6eced1dc0682d034d68a054cfc4/puvozerar.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607444137989c---vugibakefewe.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2608b40ac72264dcd65673d56f396790/wubiwasuzipu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4483e8f6f---68403007066.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a59aa41ab---35963101940.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/fezuwadofiwafowapira.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rluf837urk58n67gc98cfm8i9g/3195757094.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b75dcbcd---sodozuziberawevivevuzanir.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/707d694c5a560383f94f5f37565f97b0/70206082470.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ba2d816aba5fabb21287b97913208fa1/30476450721.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_off00011121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11121 10524 bytes
SHA-256: 5434134f78c21a27005341bd8d31699ce652690120b132622358999358a0d44f
font_01_sfnt_off000128f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F3 17056 bytes
SHA-256: 6cdba9375efe46b4b72d0db3a7014ba2c31f648445ac4151e3536aa28f2761a2
font_02_sfnt_off00015539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1