Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23cfa9e1a3fc28e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-24 21:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2db5c249a2b8dda8cd0c2c0e221372d5 SHA-1: 09ec16f7c7d634c904e699b32c9979deb1a9c331 SHA-256: e23cfa9e1a3fc28ed132e7f1ebd16056ff0a65c25274dccd549d93aa2c6612dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links. The heuristic 'PDF_IMAGE_LURE' indicates it's designed to trick users into clicking an action trigger. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting a distribution network for malicious content. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 2 text block(s), carries a click-outward action, and is only 69 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://fgcrubochi.com.ng/ckfinder/userfiles/files/42949464267.pdf In PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/77034679477.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/16770894449.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/sazesunevorafaboz.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/2925526572.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dewotobomowixigixi.pdfIn PDF document text
    • https://ferropula.hr/files/40542117497.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/als755djq6p7r65c9bl6q76gq2/pajofojowetewejulemuf.pdfIn PDF document text
    • http://belovosushi.ru/files/negogoto.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/wegedapobedudawiruru.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/sepefixofalisegezovudi.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/lezutubosota.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/wixipubijapimoxawifumek.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/zozasujuv.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/wofikobexu.pdfIn PDF document text
    • http://dsagco.com/Upload/file/jinalowogep.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/96277451431.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/65920529827.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/53325988107.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9808150246b752d1d6e3476a2c253263/58457940918.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/lubajovurajalitu.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/bigufijowo.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/virazu.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/45991736798.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/vavufepomev.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161402be5182c0---39023197129.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/63363195485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=types+of+horizontal+wind+turbinesPDF 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_off0000b3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FC 11056 bytes
SHA-256: 0762cdfab4b0a0e4158836155f47e0c213bfaf2d899af99007a3e318eb7e9654
font_01_sfnt_off0000cd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8F 14504 bytes
SHA-256: ce53a31b2cea4df64290c73f7b5887a45ba4490ef82aeb96ab6e971957052bd0
font_02_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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