Malicious PDF — malware analysis report

Static analysis result for SHA-256 a635513976858088…

MALICIOUS

PDF

78.2 KB Created: 2021-07-08 08:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: eaa4977eae9dfb08b55e064482cbf9a9 SHA-1: 15f07571c8a13d4868658cbe7e87a74647939124 SHA-256: a635513976858088db7bc7fe8200bda67c838d99aaca00ac6c8934e55983ac91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS upload storage or disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://synerhu.ru/uplcv?utm_term=compress+pdf+to+2+mb+online PDF link annotation
    • https://bamor.org/userfiles/file/fawitasugobip.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1449434448609f3ff9ce9cb.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/21836259029.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/durixeviniguse.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/6a0d6811768a3bf74d1cf09a72a9df9e/mufur.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ndp6r8u7r39f070gagcj5neek6/72200373575.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/15150528228.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/tijetoniwo.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501211445846175.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b17d7735e3---98309347874.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/p3k0f3828q4a530okmpsrnbs94/zoxuz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/nra70dej1cmh7mkbgsbqjg815q/taridumusususujojewa.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/vesasuruzosif.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/zubebinoporulezufija.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/jufakurojag.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/81376935599.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071f8fcea74b---pasatuke.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/repepowewo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cc6h8ftvfg6fl8mq4ka6cmn687/riwefifukutefegifepixup.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/sl3r8goti4pceg14cnv9gjk9ah/pobivimowupalurid.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/famuziravodogew.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/28275967738.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 10788 bytes
SHA-256: d0e88228d2a8bdccb31878834b5bb9693efb418750727702e1f49756953dff31
font_02_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 2524 bytes
SHA-256: a619ee154ed7eace6c3be45ae9fbc6e1500fe0b2cda533adc546b6b18f9efcd0
font_03_sfnt_off0000fd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1A 18116 bytes
SHA-256: 9dbaa5725b12bb127f729b54c65bcc7ccfadde5a79596aea8c0c1093a0bb0b75

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