Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a8a704b6afa666…

MALICIOUS

PDF

92.8 KB Created: 2021-09-20 00:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93c41a8f1e3271114af4ee94fe351c06 SHA-1: e846e96e395d7449bee83f80b05431712fec599b SHA-256: e7a8a704b6afa6668a80c7dbdf0ba07edfa2a1854962f62708470d8bb70914d7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/sq3gg4uscq99q60frsea1ea03r/28548974496.pdf In PDF document text
    • http://kolaykanal.com/userfiles/files/32942587961.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/desavokufe.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbd2dd39a54e7b91f6ac3cda25ea0435/40332026299.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/92586139164.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/3803792440.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/42193154398.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/manibuj.pdfIn PDF document text
    • http://noithathoaphat11.com/upload/files/bubizelemusij.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/63141926521.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/jabojuzazasojigiz.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/44079865681.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/wadikike.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/nokuwaro.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/78876845195.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b57d6b63---ragirusili.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/gotuxumu.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/52770217519.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/24382690378.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/81272988328.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b622a1f7d---30047143658.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/23269128939.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/80724042018.pdfIn PDF document text
    • https://suncables.co/images/file/sisemotijedovewew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=android+troubleshooting+softwarePDF 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_off00010703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10703 17408 bytes
SHA-256: 923bb84949ea12c02653a2b9800a6bc2f455ce0bb95bc0373c140461aae11f47
font_01_sfnt_off0001341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341B 10940 bytes
SHA-256: da98846282aa6bd5bbc452204adc4cff47ec157c80402a2eb1f11e0daeb6235c
font_02_sfnt_off00014d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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