Malicious PDF — malware analysis report

Static analysis result for SHA-256 34139b8cf9287f5d…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 05:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf6e3f498d3f826a0c15b93eec662606 SHA-1: 8213af4571bb39f75605449ec85c1665f1e450e0 SHA-256: 34139b8cf9287f5d34b44cd06ca515e212680191de890b8b3fa5ec5ee16afa72
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=vijay+tv+new+serial PDF link annotation
    • https://maintogelonline2.com/contents/files/doxopidibudana.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/palenat.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/33889219438.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/vejoxutegegojalofifumoma.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/db1pfdhkkn3vvur3pfstpiee1r/pozopomemukalix.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/vekozafonoxusag.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/73064811392.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141446ed7bf2---namevofaxejoma.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/06vkha3qvv0elom3d32hi27a3l/gopokokozexefipofow.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/zusaka.pdfIn PDF document text
    • http://jycjqj.com/uploadfile/file///2021090822085070.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4rn0lti8ejhesbk7qs44lq0nm6/bufitelodudob.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/gefinepabevifuguna.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa1b210305---65839544877.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/janadonetabafuf.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/97435331315.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/vonutilixufagununoluxip.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/vagovo.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139c7f86cccb---2176845093.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/ligazodekeguxoramipojife.pdfIn PDF document text
    • http://partnercable.com/files/76594952515.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/31680386681.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/babudekivizakifivowefan.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_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 21200 bytes
SHA-256: 8e196e3c8993d1a8a8862a9294e2bcf04d26e1b158d3fef45946713d42e0d90d
font_01_sfnt_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 10344 bytes
SHA-256: 1efeb3ce26149b624f2eb9eb6c72b0efe6b84e921d26f990f8fc317939ca2af3
font_02_sfnt_off00011530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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