Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b1b3a00cf61954…

MALICIOUS

PDF

89.3 KB Created: 2021-07-25 08:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 45ae7fd6995ca81a0921808d950914ec SHA-1: a4d07dbfc415a8e6f7aca3bfd7dcf1ed54f6f65a SHA-256: 29b1b3a00cf61954ae274ea736d58ea078b8e626f27fe5c1d5c6bc6cc32e0bfa
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely for SEO manipulation or to host further malicious content. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb471bed054---tojapofe.pdf In PDF document text
    • http://ankaraeksioglu.com/resimler/files/resap.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f84abd6f---farulezolu.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260dc3d7ab---83176775064.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/cck4fuce470093at6s37cuiivs/netulevuninokobejunobal.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d19bf7ee---28669777507.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/oobh68ftp7pcstf5rosacndrii/wiwafedaragep.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa4ee3fac---86677752358.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/wipugurijazigeverubesaf.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29980b74a3---33656521614.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/vitigevamiwusaxosu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/65601685840.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bb5b4420f---9024782826.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9tnvrfd44nn15ehj9s4f2o4c92/kiroxazubuwugujasovobuj.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/zapili.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/jokadev.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/zopedokabojerituwovid.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/dozugojefulezolikapomisa.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/4630087279.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cd8b04cfe---52635676014.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/motafisiradalasir.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/76516354331.pdfIn PDF document text
    • http://zzweien.com/d/files/65287084146.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/26181029789.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/zoweruxezadogematem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+jelly+mean+sexuallyPDF 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_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 18308 bytes
SHA-256: 3c318827d5ad149a433a59b79b121b2a4ced6bab318ba239edcf482f2e3dd83a
font_01_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF2 10760 bytes
SHA-256: d9a41079efb1316ff9a98f66b1cee5a7779ffa2164133aa5ab48d6be3f140e69

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