Malicious PDF — malware analysis report

Static analysis result for SHA-256 af42a23af890df28…

MALICIOUS

PDF

69.2 KB Created: 2021-05-02 08:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb7859df21560f1bb1b9884c445862b6 SHA-1: 207de7f8653b3a66f510db626c22d7429159403f SHA-256: af42a23af890df28c17360f37b19d11ee76a6e7d4bd9ac9583726ef4b8d93a41
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, and contains numerous links to compromised WordPress upload storage. The document body, though heavily obfuscated, suggests a lure related to a graphic design portfolio, likely intended to trick users into downloading a malicious payload from one of the provided URLs. No scripts were extracted, but the presence of multiple links to compromised sites indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9648d72a0---zedojexarutatelotej.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/hf66nv9cifdfjmst17o4s3i0m0/nawesume.pdf
    • http://aj-logistics.com/stock/userfiles/file/rinojuvomekazuzud.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608df0b6123de---97609787597.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da255dd748---bagireritoradufafoveveneb.pdf
    • http://dok-vo.ru/userfiles/file/wanuvunivakivusikakid.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/8177fe63591660a8cc85a03b10c830bb/vinolixivefidavajujanufi.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/b7hvh5sbqm68mapd1l0vq0rtj7/46024137846.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd05df1cff---58751236845.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b95676fc---diberofobobox.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9ml8sfgbnp9korbv4427c0jpff/paroma.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607658e6ba2fb---49922570525.pdf
    • https://alshamiltrading.com/alshamilfiles/file/86954391236.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079905f8b87c---xemamufimajavugeliwuxim.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9cbce4e96---jikalotowaxoligorovujago.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hkj8v0n2u3d6c9ct75f9m3d321/fedamepivaxilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=graphic+design+portfolio+pdf+format
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d294.bin
1c58f1b3b3c1e2ab01b96bac254d48a61f65175458860e5e282d33126a8760a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD294 5600 bytes
font_01_sfnt_off0000e57c.bin
771d941b38498dd3db4d15a7bd64a9d22ad5c30fa3ca65f4cc060975a0e4f4ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 10124 bytes

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