Malicious PDF — malware analysis report

Static analysis result for SHA-256 c734dd92519bd7f4…

MALICIOUS

PDF

166.5 KB Created: 2021-06-29 23:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 018955ba9db0fbb0f7a139269a58eb59 SHA-1: d18e0a31f3be6e4398f7241eb6caa5fac520e235 SHA-256: c734dd92519bd7f470993eb58d934e4d514a0cc0b2705ee2313177c3a251c6af
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/4ai0qtk309e68m10bgkmhpc539/64457567470.pdf In PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d690c744---75640717845.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/tuzadosotuverab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dec37ad0c---japivosaserewigaranusodob.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/32717835436.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/47808103422.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/46022955096.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/83959b74c2f67f8173edd2aea895ed57/96599347779.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/mnudi3f7jf0hc6aiu573eudc7t/34561179698.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/89967450642.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/32b2cbf64de053c0a2cdbbfffc2716b2/48902034195.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/dd07ov4g4c4j92453vhq068nmk/wudinotosoxi.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8e5cd55a---73900543979.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a664785a987---7318510997.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/307e5cae7ca90c46c18ea2b165a3671f/gogusadoruvawoji.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe40e36d22---dopow.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003ca5165b---zabelolikositepujuwafis.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3cf8dt9sh6tcjaiit0djil3ge2/63588675321.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/63790831477.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/fukemev.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/43203505130.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/3j3boik7pd6fc9n916co5pmrr8/sekeweredogewijenavisam.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6479d23d7c---69406899642.pdfIn PDF document text
    • https://cm.blazefast.co/6e/e6/6ee67cbd4900ed3a23644a57c12666a5.jpg,https://cm.blazefast.co/c4/67/cIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dragon+ball+new+age+chapter+27PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C951 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E168 10792 bytes
SHA-256: 60e23e9bdcbb6f94244805877666b387a43a40cab1810913aba715cbf4ef3605
font_02_sfnt_off0001fa23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA23 30776 bytes
SHA-256: cfa8d8876a83f5a91fda07c60dd68f669679f5d5df3b80ae54ea231095c0b889
font_03_sfnt_off00025209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25209 22488 bytes
SHA-256: 8f5eac5d83b3f39e9fb07f1273a7170154de27cfd50669bfc68f362c2f4e0f8a