Malicious PDF — malware analysis report

Static analysis result for SHA-256 2175bc7864ce4900…

MALICIOUS

PDF

69.6 KB Created: 2021-06-19 02:04:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2991db05256f46eed976a1bd84c79fef SHA-1: ad090689242923b0b72233035340588fac261bfc SHA-256: 2175bc7864ce49005270e02dd79341dd35ba3d9bcbf2d6ccf635be1834b2293c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely serving as a lure to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kochamsushi.pl/UserFiles/file/87417179828.pdf
    • http://bright-inter.com/file_media/file_image/file/35332554395.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/he12site8bq9i0sqd5v9p0bs17/lawufekibigasopanilupunuj.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc77e20503---48928195450.pdf
    • https://kingdomofgodmn.org/userfiles/files/55722193693.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f74dc352bd141c996aa7b33a0e90a720/47107645281.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1a3017aed---zekanonoxupurafojap.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b5273a6a---nivifodesoluvoni.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a82b4b5dc---52291620851.pdf
    • http://www.ks-zahnarztpraxis.de/upload/files/66574434934.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93ebf0a47---61222367938.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711e6385ca6---lesatonatasuvefofababifo.pdf
    • http://uamarkets.com/images/file/kegaloxevapimivisavuvudoj.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af30b36840---6984786923.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719f1d711b3---11091937501.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/55e9e09bb77a8e69057630413a523175/tabejafawizo.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608343ffab5c6---80298951739.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ninjago+season+11+episode+1+english
    • 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_off0000d0d0.bin
dc0e8ac303648183dd454f68acec6e14f0cc3647f93ea89fde90ca95e5505cda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 5220 bytes
font_01_sfnt_off0000e2a3.bin
71570fef45fe09abfada04994333df98ab8ac159cf19086bc81742b7d86e378b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 12024 bytes

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