Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd11ff991a40c243…

MALICIOUS

PDF

124.2 KB Created: 2021-07-23 11:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f1b26b047cfd3fc7f61cf2b4b4affbbc SHA-1: d1c4f8d457417fbb8783b29132d3cfbd3519625f SHA-256: dd11ff991a40c24361ed68f06b7032880b0c2dfb69f96de30b50d20d4fe57b53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://nagymester.com/userfiles/file/jaxuvefagulabada.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7caaf414111f67ddfa96671e3380fb4f/33187054460.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e9b00bad---3624642679.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/8is7q2abnad3ohsnstehrarqk5/nudalurexawiregug.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/38865174020.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f46b2304a---bovojajefomukudemawejalo.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/sv28qi1elu6ei5f0cr8kbu6ku5/xivosowopod.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/59925043434.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160947d1356a6f---35024114744.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feaed70d79---3637033595.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/mosezat.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9ef61c48---dalazuwo.pdfIn PDF document text
    • https://jurad.eu/files/file/joturinepudizufomelos.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d51924197---guveboged.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mlravqb3h0i5cc5v4am4v75sii/retadojowelu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4fe6483d4---juvekuluzosoturanodit.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759d3e9bbd7---52313813191.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/1314993660.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/25j7o2dns0nld5qlcbqpq6bhhv/41444621635.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/sujunefifadatepelixamo.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/16204608053.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/wakinonawabixitotifi.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/nexawefuwajawur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=chris+aceto+everything+you+need+to+know+about+fat+lossPDF 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_off000179e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179E0 11384 bytes
SHA-256: ec9ab308a98a49e7cd0c2fc080e2075a76e08fbe237eac2f373dcedb04fce7f4
font_01_sfnt_off00019497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001aca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACA9 20376 bytes
SHA-256: 089423636d687250591978deacba53a10819b6f11fc7e223d3a1d90c126c3ebb