Malicious PDF — malware analysis report

Static analysis result for SHA-256 669bc1726fe6b8e6…

MALICIOUS

PDF

73.3 KB Created: 2021-09-27 10:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bb8f78a1188637e88bb47c69e07091a1 SHA-1: 5de4f2e0b8bc47ee5a34637cbbf2360a296eb3ff SHA-256: 669bc1726fe6b8e649c325d87cdfb3f3ab6dec967c5ca1134ec10774bb3e6f58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a phishing or social engineering attempt, likely to trick users into downloading further malware or visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615063a30d2ab---kimikadepipejodiped.pdf In PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/10941996165.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/lujekovevirakubal.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/levozijawago.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/senivisoxawerufusezo.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/kazosuganininesifinor.pdfIn PDF document text
    • https://superchills.com/userfiles/file/beselosimitimip.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/kazosodituxebedepudenog.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/18175068109.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zesowesipojegilun.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/xosipigixudavite.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e237ee07---54976036237.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/e5hvgc292eub8q1dgng55coih3/20678090435.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/41144999046.pdfIn PDF document text
    • https://bak.vn/upload/files/30283844761.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/varekivazeze.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/40743768579.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/telesurux.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/285250941.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/pojagilogela.pdfIn PDF document text
    • http://www.bash.cl/media/file/lenexotazujosinam.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/8285158220.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/pufogib.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/58515677741.pdfIn PDF document text
    • https://choosetop.e-giant.net/fkupload/files/48800113291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+ios+launcher+for+androidPDF 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_off0000b98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98E 10660 bytes
SHA-256: 679fbfc15d0b02631b07a7008262c0a38c809163904490de3745d18ac02fedc0
font_01_sfnt_off0000d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA06 17580 bytes
SHA-256: 0979862beb3cf6e688713a0150d09890ae413eacdc7921fad090653b945872fe

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