Malicious PDF — malware analysis report

Static analysis result for SHA-256 227bf64ca92bd998…

MALICIOUS

PDF

111.0 KB Created: 2021-08-14 04:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5259de388e49a541fe82ce7ff1056615 SHA-1: c85be2eacd305ab4eccb25d97d6ea24b41e59512 SHA-256: 227bf64ca92bd998495ffe9c6708d91e4967a556d1edaa48214232e96f69c801
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://crewmak.ru/uplcv?utm_term=shootout+at+wadala+full+movie+download+720p+hevc PDF link annotation
    • http://synerfreight.com/syner_upload/images/files/85236536816.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/darewagufumosifesaz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/6plt1thgl6kjka7kvuvuqsa794/pozikonadukagos.pdfIn PDF document text
    • http://arlingtonhigh1959.com/clients/863184/File/22784961645.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/80190377306.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/wiladajubunazi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d76d9febd4049269bc39f253970b4983/74304882938.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/kexonupiwidil.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3820ab41---20182591556.pdfIn PDF document text
    • http://normel.org/files/upload/file/16045356089.pdfIn PDF document text
    • https://carlojans.com/cms/file/zuxalozine.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/72278373759.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210730005126.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/530r9ulf7njfn6jf0ord5qq7t0/vokiwugako.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103027bcf064---2548527720.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ucm2dpkj64mum422kjafs47fq6/xepavoki.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/69c73806f2d3353c0045626ab1d1d226/6874720013.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/rifogaxekanakonofib.pdfIn PDF document text
    • http://billsky.ee/files/file/19603192739.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/dipivetubitezoma.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/mivuba.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 2528 bytes
SHA-256: f77be7cd22ea4ab2e740daaac1c5736771303febb6fc878847eb6d3d6f23970d
font_01_sfnt_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 11236 bytes
SHA-256: b1372479e583e6c73cc6950c9e16769a192c27b0de0d43a826fc592fd5a49519
font_02_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 23184 bytes
SHA-256: f7c7768264b951d052b681445dbcb343946b1595118ebdfa5c587f8dd24d1170
font_03_sfnt_off00017651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00018e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E62 18856 bytes
SHA-256: b9cd5de7f8da59b226999e97c3a65e431753d31ae08b42d28990af1bba33b5dd

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