Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f41ac18e0c89ff3…

MALICIOUS

PDF

85.0 KB Created: 2021-08-15 18:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7d1b48c7dc5c92d32826e7f5aedc16a9 SHA-1: eb3d0dd8eefc0cb4692cd02cc08063d0ad58faf0 SHA-256: 6f41ac18e0c89ff37066e25f2d9d00418a15613e582ba7b1c0fb1cb40ea1b391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosting other PDFs. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/cb66c11ffcdd3043c938c5c032991399/jowesirabawupum.pdf In PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfa7e5618a---33635575522.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tfiiol8q5rcelb6o2e08n9iee1/62016908622.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/xugojotopenagekoxe.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09768ecaf---57459655961.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/78495485168.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da8202604---tujefi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/dcbc8afa583debde31f4ba1534b028e6/13741144783.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/ddd777d7cd5d340c9a6e70ba626fed3d/85589774623.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33f807c81---50861904436.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/3ur5uisiu8df4gjobj90ses8q7/livumo.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/38271431661.pdfIn PDF document text
    • http://terminsk.by/pics/files/belesasenavasepe.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/44515768760.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0046061006---jurazagexu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160df895351120---bugokedirewegolevanozore.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/foxometatavigekepoxumaliw.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/sixajusiredusiduja.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/sosunutufimiwowewav.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ss75kv7tra84qcr3u0vjs6q753/63638877255.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e049280ac8f52b4ee648b754ccc2be91/zajizibonab.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/lafuvumolimu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-10/20210610124219468631.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202108112259399945.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/jibetivufepuw.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/99508598188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=heather+free+piano+sheet+music+pdf+intermediatePDF 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_off0000e6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10932 bytes
SHA-256: a45c89420bca1ffcae2eb1dd30431859b09541aefd6248b64c754ea6c85de3f7
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 17192 bytes
SHA-256: 7997b65e85a3decbb9449f7e8589f05f9acee4fe5ade9a0699a1021409937db9
font_02_sfnt_off00012cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1