Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7a8fc47fa0df5f…

MALICIOUS

PDF

75.0 KB Created: 2021-06-21 13:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b90b9405f2261c0cbc602ce137e3d4ec SHA-1: 9ccba5d62f264492c3ba4ba725c9523e7635d32b SHA-256: 2d7a8fc47fa0df5ffc405a6548049a40d4ac73da1caf86db74e687b6f1fd52e9
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to compromised websites, including WordPress upload directories, suggesting a link farm designed to host and distribute malicious files. The document body, though heavily obfuscated, contains text related to downloading a song, which is a common lure for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://osoboebludo.com/ckfinder/userfiles/files/71122672306.pdf In PDF document text
    • http://modra-skola.cz/userfiles/file/90837102847.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6h26fn9b0773s7oprgge1f96u4/turovudilipoka.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/nifotetejoromesowupoban.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b530cb947a8---tuvugolomoderewadi.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e60ab12049---96654902012.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160768c080e9db---disemukowexukewotoxo.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/62919071066.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609625411b6c9---paruramefovegazawemuzas.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/05390065078bd7e5fe4cecbc93a952b6/59541867551.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c198df052cf---bixifaxomopogitadizemeb.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/82067040028.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a994640bc3---70567184136.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//lujuwi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/002oot2chfd42n8ovr47q9o8k4/dazamiwezosapedepa.pdfIn PDF document text
    • https://aspirans.com/files/file/85398019865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+alicia+keys+girl+on+fire+mp3PDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010349.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10349 17776 bytes
SHA-256: 2005695df3f7c7e3f481796a179846ac74bc9c5fedd02bfdb2bc7bab7c73f4ac
font_00_sfnt_off0000c836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC836 5896 bytes
SHA-256: 9ab27e71ab59b14325e828670b9e15aabe46ff348b19f9aa33acbe83cf1ca57e
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 11724 bytes
SHA-256: 3a45df9f2c3e7635dba1eb07712eefc26b06fc96c57efbb91b56b93089df7431