Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b54ca38c64e0898…

MALICIOUS

PDF

69.2 KB Created: 2021-09-19 02:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b9c02628fe7d4b6db486b4e23a84b96a SHA-1: 3bc62817cd5448b5f4ba0309673ca961dc0aa129 SHA-256: 3b54ca38c64e0898cf2f01ca6460ef112b468adfa084d6743f39c4e834ebf4f6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure with an image-only presentation and embedded action triggers. It contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to direct users to malicious content. No scripts were extracted, but the overall structure and link farm indicate a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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 http://studiobaldizzone.com/userfiles/files/67472986003.pdf In PDF document text
    • https://abbma.in/admin/uploads/file/xanibomatududu.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/96656338706.pdfIn PDF document text
    • http://lejonhund.com/upload/91447641480.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/39764844680.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/pidiromo.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/zidorevin.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/241vo1jvp60gnd15gb4bvvant3/foxapir.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613533e73c6c1---57772571094.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/94696568654.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/25644351924.pdfIn PDF document text
    • http://aweibel.com/Photo/file/ketudasenilivomixopugu.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/voradetaditofobimakizubax.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/41432704414.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/10981958766.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161465dc4bf57d---nusejibibozeguzumeniwuwef.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/67052452100.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/vuxetolu.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/62211522298.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/balifanovuxopipokafej.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/1805340409.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358c43c59ac---resazib.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16144ae49997b5---soselojututiw.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/34619866097.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/faridafurelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=product+rule+derivative+examples+and+solutionsPDF 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_off0000b2d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D5 10944 bytes
SHA-256: cb8c985de4d334d54c7d80a803ec5b2e930a1f94e56e3df2e153b805cc18cfc9
font_01_sfnt_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 13772 bytes
SHA-256: 14a48397f665f6458499fcc68ad4b334dcdb4c8fa44a33cb0780fb46385fdd84
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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