Malicious PDF — malware analysis report

Static analysis result for SHA-256 be51322c8f3bca82…

MALICIOUS

PDF

76.6 KB Created: 2021-09-18 22:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2bede0314f34a93d35756fd22aaae11b SHA-1: df368491822a9b8e321e33fcc0924d7edbb12f49 SHA-256: be51322c8f3bca8272d7ea9312f3ec33affa19a23d896fa621ce3000f69f77aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URLs, many of which are part of a link farm hosted on disposable or compromised domains. The embedded JavaScript and the link farm structure suggest an attempt to redirect the user to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=merck+index+pdf PDF link annotation
    • http://loadcell.vn/Images_upload/files/59447531669.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16141684774497---rotifajamiminovixazejapaw.pdfIn PDF document text
    • http://noithatmyhome.com/img/files/mufuxemufum.pdfIn PDF document text
    • http://chinahongji.com/d/files/14806402632.pdfIn PDF document text
    • http://eternoohydro.com/d/files/547696604.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/linakevejewafitav.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/71473372294.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cbbd9d2b7baab3f30ff70293fe4e694e/kuluwapuwovorawixe.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-12/20210912202818394520.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/zaxipilenudiluvimurenod.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/vaxuv.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613103f4d752a---mofadadavilonisubepiruno.pdfIn PDF document text
    • http://decoworld.in/dayafter/uploadimages/newsimages/file/fexadixefuji.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/luxupewifavaz.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/gukoso.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631971820.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/tonexidelovixes.pdfIn PDF document text
    • http://airzo.net/userData/board/file/tisuxejejubegati.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/sarawiwavivigunaveze.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/35230961553.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/45152014684.pdfIn PDF document text
    • http://katachizu.com/img/news/files/sopuzunavape.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/59760243107.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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 18056 bytes
SHA-256: a182badb75439961f29773726bb0530dbcb732e5e1c0678a26f0004f375305f2
font_01_sfnt_off0000f65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E74 10204 bytes
SHA-256: 42f367fe8d8eff427bf8032f96857171e8966c1de5282aa482eddb7303075b03

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