Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3d0934531191f3…

MALICIOUS

PDF

132.3 KB Created: 2021-07-08 05:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 163f6ed4ee02055015b0c2197be7d8f8 SHA-1: ab474ea24b6bbc5fe2aadc386df98c222b6b1661 SHA-256: 3a3d0934531191f3e4bebe345d21a9dd0aa6d2efcdc693fca9622f366528d3c8
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to lure users to malicious content. The document body is unreadable, but the heuristics strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=what+is+noble+good+in+philosophy PDF link annotation
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9a0f8ee476f53675fcf242d9e65c4049/zavabi.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/tikof.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/tefasepuxuma.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d51ebdb5aee---bideluduzujopuxarogarawol.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0ea27c114---49929819031.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afb87752da---58362315801.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/lubuminenokidezeduzoz.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/sirevagow.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/e980aae1aab4abb03e6361a3e1ec8b87/pupuvetavojusovuzawi.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/dojuja.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/93210930208.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429153237748164.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/lexemawab.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/rizawevofefubulitevuwap.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aac98eec---mofimido.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/juzopopukuso.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160d60b4cda32a---jukasevowatukelux.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/mogitufise.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160748b4ce99b7---didawo.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/57751152994.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786de22266b---ralifimim.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/19965782588.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160856ca6a81aa---1292267653.pdfIn PDF document text
    • 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_off0001a64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A64D 10816 bytes
SHA-256: 3e7617ef59216913b62aeb46381613d6654840687862d3f38ad29bc6428e2b05
font_01_sfnt_off0001bec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEC5 17688 bytes
SHA-256: f0191d505240d6a685e861e44c816f878fbab820d8c780f9df695a10bb05c888
font_02_sfnt_off0001eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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