Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3edc31c13fe173…

MALICIOUS

PDF

94.5 KB Created: 2021-07-04 00:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ae1542e46c4498c2f2b6d0b069e6dab6 SHA-1: 5d29c6cb9ebd6bbb06fb6e842145083d63d17e0b SHA-256: 0d3edc31c13fe173a0aada1dedb712821259f49cdc978c31d72abb5b98df8a4d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for initiating malicious actions. It also contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=another+word+for+accurate+and+precise PDF link annotation
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/vowufumadalotu.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a3828b7a0ad5dadb21d9699956638f61/vudowodimavo.pdfIn PDF document text
    • https://ovth.ch/userfiles/files/takeris.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608323ee8d12a---69730336827.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160963c6b12f37---rofen.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/20b841a19142be1b1fd1a6be36a3d8b0/vizaziso.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/71525380893.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5251dbd77a---gaxidelikixow.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/6bae8ad302eea5decc83623dadb36b05/pigewasarebemipilaf.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/bizobalalegitiji.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160be40895bb3f---wimamorirufuxeloxisagisax.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69de845e45---36188981903.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee775f457---wulolisewuguvazafupogigu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d68c1f38a---fusegabogogalatatojefek.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c5423b17e5921329474517ad51c2969/vunevatedawetetulukamugo.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/51237552306.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/95bd21a30284b59c11f711c5ecaab23d/lezelemazugonibim.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/fifidujiwobopif.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/479cd253395b267978d6f0d4df99966f/xajabup.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gubike.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d4e3286657aafa40802da3658b3b4084/78902366568.pdfIn PDF document text
    • http://cga82.com/admin/File/nesegagubadipuxozugover.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/69d67d0cbde513bf2e097176d8373972/navojujinajuxukabuto.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_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 19108 bytes
SHA-256: cbca35d1057af2cd1e8dab45954d451e2e6ea49db0cfd374515538e8786ae45d
font_01_sfnt_off00013b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A6 10840 bytes
SHA-256: 6e2270290faed09142a589676f823a94a6942d38fcd62ff951086025457907c6

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