Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36640c267c13c09…

MALICIOUS

PDF

76.6 KB Created: 2021-06-29 00:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 391ecf15e0aeb342f3631299dfc0cd9e SHA-1: 0edfe89d8feaeaf109643fb7b7068ac7cf7c42a1 SHA-256: e36640c267c13c092c55dc61f6b04aaaf4bd6b060a8a48f5a3b3793c35b2ecf1
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm hosted on compromised WordPress sites. Multiple heuristics indicate the PDF contains numerous links pointing to distinct, potentially disposable hosts, suggesting an attempt to distribute malicious content or conduct phishing. The embedded URLs and the nature of the heuristics strongly suggest a malicious intent to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087706b63ebf---60645895724.pdf In PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e295e2702---58727077837.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/pekasuwusewilefodi.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a0bce3f56---77512264525.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/dabeterasixagazut.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/xozisa.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609719a2ca847---fijatemexifemeziwezikivin.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/qe2iq5d3a6ddpush44b1adl3s0/54441508254.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b59e0707c---zemeb.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacb5395d03---gagodedivejudogubi.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/viboviwibitazajaralin.pdfIn PDF document text
    • https://everestart.com/images/stories/file/4199254695.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/legurure.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/14459870327.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/zedupupufejalovijutorub.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0dc3150a---pifoxipizidodexug.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31f623185c---fanigomufowedusediduge.pdfIn PDF document text
    • http://kelvista.lt/images/files/pitubujubivopekapesi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55d65c1d70---terawip.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0bb7b015e---lavagabagapejije.pdfIn PDF document text
    • https://turismoporsantander.com/aym_image/files/40008551429.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/melivakokubewux.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d942d7e6f84cea03a45f6098d5c111c/12048946496.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c8a6j71d6kel8q0g6fe6m4ku9l/xakifoxivuferu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=us+history+staar+test+reviewPDF 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_off0000c827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC827 10328 bytes
SHA-256: 40a5a41d1c5a5dcc8d722f6c1de6d7d4cd85a89a443b2ebb27506870df90a40c
font_01_sfnt_off0000dfb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB8 17532 bytes
SHA-256: 57feefc6742c3410325d32b24ff07bff6d6f81dec19a6cebe3c13922edfef93c
font_02_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1