Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c36809bda43b98c…

MALICIOUS

PDF

143.1 KB Created: 2021-06-27 06:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d1623e84ddd0239769e0c2933a89d2b9 SHA-1: f189b80a5ff2c729fe70417f34a15f5526b418ca SHA-256: 3c36809bda43b98ce74337b3597103e52d02f821e06974723749af2f9355b989
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing or malware distribution. The embedded URLs are likely part of a campaign to redirect users to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/klev72epk1rmbep9j5l4pbl76a/mewudobuvidiladuxizuf.pdf In PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3f5d23dd---13836027587.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16070c34733216---69042892566.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc29aa8388---migobowepid.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/2128916125.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608316d170312---tunoludav.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/logafofaremadabomonu.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/0004eff0f3fc3f8cb97068c03e138417/45728878523.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/04005003705.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/tipedalopi.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ed83b92512a9fdc28afb9e41f93b7652/32817202119.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/68752863705.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/12645004041.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l2gdfkqvhdo1vgajklf2dlchsj/77357554916.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac193d95bcf---7737912630.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a07454a386---786634588.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/93760325180.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/damumafugoxivepola.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/09dfc24913e163138c0145015063d547/57148387480.pdfIn PDF document text
    • http://gtshotel.it/images/file/80697728625.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/dawubabelivekuxote.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b6044b8f2c7---bimemawemurikatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rocky+point+real+estatePDF 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_off0001d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D334 16128 bytes
SHA-256: d851eff45f432ce18f86924e7a8612e09b9b7cb1d5e4bc8ad2a06673a50ab52b
font_01_sfnt_off0001fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000214b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x214B1 10620 bytes
SHA-256: f2a92978b0e055425344bbd42fedee5cedbf0cb84390cb9baa44e7bc46d82892

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