Malicious PDF — malware analysis report

Static analysis result for SHA-256 2070e5f7a89255a9…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 17:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 895dea73ac8a48721138e676a5a2e5ad SHA-1: 9541df73a64f1c731fe81037dfc63029e88da924 SHA-256: 2070e5f7a89255a918963832f6f3c708c58b6a41c21b85fbcbfcbdbe492e99fc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URI firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://chcial.ru/uplcv?utm_term=9th+class+ki+science+ki+book PDF link annotation
    • https://songhong.info/userfiles/file/31959768703.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/34488427517.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/varuteda.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/20274628465.pdfIn PDF document text
    • https://undergroundtakeout.com/userfiles/file/bamifutimo.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/vanuk.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/61284624964.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/femararogojalube.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/26764011622.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/27501906418.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/97946250790.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/davugibotejonizegotaxub.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/vamujuruguxesugemegunima.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-16/20210916200454158697.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fa426b665d332887a9099b071b128f11/delugijubividujiwif.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/87245475874.pdfIn PDF document text
    • https://norservis.info/files/files/47344031545.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/fanuwolojosoxox.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/sobatoxafesapener.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/2902490375.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/67401539878.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/4516872125.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142543fc6b3a---wazajotosuxefovozi.pdfIn PDF document text
    • https://panoramabyty.cz/content/35477404632.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/948bfe6b7ee2645824254f1dd1d00ab9/24966659313.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/wududebawarisaratov.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_off0000d8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B2 10528 bytes
SHA-256: 048c0fa871fa6348c44f6245b48f2e40b61da31c589fcaf5d3ebe4f8dff545d2
font_01_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 17924 bytes
SHA-256: 77f79b2e7dfe0211e1f949bddb4d9561931f44e2655730d4917d66fa303bbaa5

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