Malicious PDF — malware analysis report

Static analysis result for SHA-256 84792ff19de530d0…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 15:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d00224564fecd887dfe7f9c2e98a9b4 SHA-1: 68c2a75ac50066ce0e69ac2f0920fb33e461d97f SHA-256: 84792ff19de530d021f2ffce8aafe7ff5accc51e5cca5bf0ce7f5679832cfee6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs strongly indicate this malicious intent. Although no scripts were directly extracted, the nature of the links and the ClamAV detection as 'Pdf.Phishing.Trojan' confirm a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://zivotzaokny.eu/res/file/72048330783.pdf In PDF document text
    • http://elskenecologie.nl/files/nizaja.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/febixiju.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/71530377526.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/44137371051.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/diliwujokubetesoz.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/78108252437.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/88503444533.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/91433193307.pdfIn PDF document text
    • http://symbolfoods.com/files/file///latafelefokugutore.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/61313597981.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/kogoxuwajujibinudemupu.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/kamexaxujolox.pdfIn PDF document text
    • http://enkepharma.com/upload/files/9261964.pdfIn PDF document text
    • http://olympusflights.com/files/files/xugeto.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/21803137304.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/robijafozu.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/59111224648.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/54083435135.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad6cd797b2---58390638689.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4f9f6e44d580aa59a3cd872c14758e3d/nojonikosinibanavawul.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/tufikijobubulekiw.pdfIn PDF document text
    • http://bamor.org/userfiles/file/35559287970.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/80376396921.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145398726393---40808383636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+flash+share+appPDF 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_off0000b2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DA 17688 bytes
SHA-256: c8c79d5945b80fe45b0c66edf4ee6395ae3d1658079ac413d9d8c95888038f12
font_01_sfnt_off0000dfba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D1 10492 bytes
SHA-256: e0370d97943fa58c499a94b185ef89777e351eb71af64bf7c4cd26efee597aa5

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