Malicious PDF — malware analysis report

Static analysis result for SHA-256 87cd6b4bd89e4645…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 03:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 355e3c187a82563f8d47195158b5c78f SHA-1: 6b06e6fcddb57abc021bbbc89c18b2f1b36e3061 SHA-256: 87cd6b4bd89e4645fc50e43dfda40a6a5db0ae5a8e61310cd4df4290e4a2e855
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://crysiq.ru/uplcv?utm_term=hello+neighbor+app+android PDF link annotation
    • http://anaminfo.com/attachfile/file/82728445504.pdfIn PDF document text
    • https://mahae.hu/files/files/58108830989.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/jamasarururipanigulu.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/rizodi.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/nonidejepuxulorilape.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/nititibenen.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/54987173924.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/9718719673.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/27909949250.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/negojazidino.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/96717829520.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409071de9f2---33691848802.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/cb907fc48c2dba19c4cc1a8cd8b017ec/maduv.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/24157373818.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/fotufubefufukozazaniguga.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d9d9be58---53891461626.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091414334713.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/15794603899.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161409020e909e---80501177520.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/1281652478.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/64209618895.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/wejedirufiduvut.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/zazuridanixojakinagup.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/wowewizijukenetafilazipuz.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133f880d0279---funojawadomawaxuriwikaf.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/77018527355.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_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 17248 bytes
SHA-256: 6ae6c26e137be9d46a08f7ed4bfffa69e681174dbe4064a005e3676f3f4b74e7
font_01_sfnt_off000113e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFD 10536 bytes
SHA-256: e1e307c1498936be4afeedaa11c4ffe86e62561cb5f46c616db31c7dafc5dc05

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