Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a9ade249b55517f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-03 21:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a7d060b3bbaef36a5538b6870f906f3f SHA-1: 4c7bb70d7e79a5d97bd02fa32a3de0fd2e3d3bfc SHA-256: 3a9ade249b55517f7f0b88a0a1b850707c8a69bb821211aa2282cab744f69f67
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content or phishing attempts. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/4f5550c30409186db5c1c1d59a499c72/15899451502.pdf In PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/63752421cd72902f4099017019053e6e/xoniwasuw.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/dsumm4tseu18blit1nhnhku0dv/95186349176.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-24/20210524031350860775.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/61037732715.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/49969915533.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd99555a94---60527844148.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/bugujezinopativopuko.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/wubozuxesudiwifigumu.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/vifewuwiwifuluveseg.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/e47de6cbe15cad2f428d8c2b394f6f53/99248347044.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe5f1badef---vubalozalabowi.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/23131995374.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210612_163615.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2b92247e4ed4f754498980b898ebb8d9/50657997482.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/95e06af53f2b1594aed3a309517a3152/14156169447.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/meveligafa.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/12d182adc6a8b6cb5512b4941e0ba685/78201520458.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/ta29rnj6j9ouavci1h3ou2vkjl/lizawejidudefunitigujodim.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079246a94dfe---wabugozejufodoro.pdfIn PDF document text
    • https://ikima.fr/uploads/file/xavad.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9338cb85---6172069511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=saved+by+the+bell+season+2+castPDF 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_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 17212 bytes
SHA-256: 7d5fb85819084220a92b3b87c6a76e8d9d4c8ccd5b28272e32396b50ae47bc4e
font_02_sfnt_off00013b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 10788 bytes
SHA-256: e411fa7f32086ca55b22b6db57faf3f99ea7e5ab1d5157ecd620764306d59ad8

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