Malicious PDF — malware analysis report

Static analysis result for SHA-256 68727e8afc560ac4…

MALICIOUS

PDF

79.0 KB Created: 2021-09-05 13:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2cbe74bcbc4f67816f64a73f78dd4c24 SHA-1: ead2e5e9309d4b2d1dbc6a01a09159dcbd8d88c8 SHA-256: 68727e8afc560ac4bd538b76dcefa619d5871cbbca75399547eed68d9e2f307c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to external sites, many hosted on compromised CMS uploads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://goldmustang.com/files/files/tiwofaxeberedox.pdf In PDF document text
    • http://ipmarketing.net/userfiles/file/66201088045.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607be488d46fb---56529360594.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c67419824dba2eb86c3b13fcb64d03b8/puviguwowemufiwi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/lasowejemuxijakov.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/29910218333.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7e5911f524d9706056778e6e86bd575f/tegita.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8d3792d0c---buroge.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/9881527306.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/wiloxulopu.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/vejetivose.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/56915117036.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/f72f097ad32624214556e5b0c97cea9b/28784969718.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3221902fa5---78674234682.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2c420158---gomosuk.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/kigaxuvifuzibig.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d4681796c2a---jakajawemagafo.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d88f7d83cf41ec28b35a051955e93d5d/56078266438.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/kiwefezebu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9f47dc968da474c97c83b2064d41e028/55166669603.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/62412425096.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/98946009046.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/ripuvusapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reported+speech+exercises+pdf+e+grammarPDF 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_off0000d230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 16524 bytes
SHA-256: fd80cb3fd28274881ab81a99da2a9c8e50993b4a7a22e74b81216f8f50bd5ca3
font_01_sfnt_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 11064 bytes
SHA-256: ea4761ae2febe901709eb151aa2d2ca70e7decdfa52a1e7213b00ed9fa5b0efb

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