Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0a6b0dc60725494…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 03:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e9f1179d63211630c4c9caff20427da SHA-1: 9a6bf1d0185985da6a6a474f5cdafa1de60d02ab SHA-256: d0a6b0dc607254942a86ff19aec5462c831cc99885e7efe4bfa4b7d9444ff7b8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-only document designed to trick users into clicking an embedded link. Multiple URLs are present, many pointing to compromised CMS upload directories, suggesting a distribution mechanism for malicious content. No scripts were extracted, but the presence of numerous external links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://medvor.ru/uplcv?utm_term=transfer+all+photos+from+android+to+pc PDF link annotation
    • https://radiosmile.hu/upload/file/teduvafib.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xevox.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/22422808599.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/48273959527.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/10416778616.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/24705910645.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/bedoxebarupowezijudulomup.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/regala.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451453f1418---fakugatobazofesarajej.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5ffa1b4b45d497150c38c187efeaa585/33272851621.pdfIn PDF document text
    • https://aspirans.com/files/file/67062533368.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/52581991515.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/wojejowikubukabetuvajuve.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/66288178961.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/modememapusu.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/46596019480.pdfIn PDF document text
    • http://dmkert.hu/files/file/77750586916.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/wetowubikolazuzaw.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210907051121.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/17913121580.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/16484734783.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/19191304455.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab427cb29f---65454505401.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614568e796c0a---birekutiwipaxidovum.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f176b10076---22894240053.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/24233019775.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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 14188 bytes
SHA-256: f8d5050ce10841e587d77b2665c197d08342372f58b51d6b25888eed226d2219
font_01_sfnt_off0000d495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD495 10848 bytes
SHA-256: 1e1977bb970ccd187ec0f6952274ed1780d5116a89d162350d18bb81f819bcff
font_02_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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