Malicious PDF — malware analysis report

Static analysis result for SHA-256 76c5e50b6d84b60f…

MALICIOUS

PDF

67.7 KB Created: 2021-10-02 21:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cfc3b21cf9e06256892a312dec87ea1a SHA-1: 6f27b1da71982229dd9ecb3790337b60494c541d SHA-256: 76c5e50b6d84b60f838874f1971ee5edce6fa5b5e88c2a90361ecc05ce2cc0fa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure due to its image-only nature and embedded clickable links. Multiple heuristics indicate it's a link farm hosted on potentially compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further malware. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/63f01ed444ed1f08a93f92d06fe78575/lurinurixefixiparona.pdf In PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/durekenunaloma.pdfIn PDF document text
    • https://subarini.ro/mm/file/luzizuma.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/keronizobudizuwuxip.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/nejerugegemobemusuwuwu.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/nanuj.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/deribazaxapotilina.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/muwavexarotafawixixomanef.pdfIn PDF document text
    • http://carbontuning.ru/file/41761149774.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/rezazukelo.pdfIn PDF document text
    • http://patroha.hu/file/92119299419.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/82955325457.pdfIn PDF document text
    • https://msvadba.ru/files/file/guxiravemugijazoju.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/fimegodumawokuziwig.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/58519317720.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/nutunegawofij.pdfIn PDF document text
    • https://mimpishio.com/contents/files/vuxuxodapawaneriranik.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/399b1f3b077e7b2bee1776c144151394/xisit.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/xurudezirojepozixasegera.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ruratab.pdfIn PDF document text
    • http://feg.vn/uploads/files/bonenug.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/zojigegifovejolun.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/8178149357.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615631d619058---2937686255.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca650d631---jotewigofolupeteteja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dropzone+js+bootstrapPDF link annotation
    • 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 13712 bytes
SHA-256: 78edd8e47d281529ce2d903ebb84d6d0c52b783b06f3c5c39f4f971e50b30aa6
font_01_sfnt_off0000d1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA16 10440 bytes
SHA-256: 1692b2c85048302fa7b4f9a4ddef2a73e7247e8b4ef378e6bd275c52d5a8b755

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