Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bf9fdccf4b4658…

MALICIOUS

PDF

85.1 KB Created: 2021-09-09 06:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d24cba697d3e0d413808be6ffc84e07 SHA-1: 3f3a4844dc8a7e34ba913acf1fa69fc537f74341 SHA-256: 78bf9fdccf4b4658447b2d85d4ec2ff88f4ae7fb01aa77b37562194df715ac88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rajnnuhiddje.se/userfiles/file/95237223382.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613432f446156---22298316461.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/jofijilikaxolozavenebo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/68456710270.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/bafuxitoraxosasa.pdfIn PDF document text
    • https://grouptm2.com/contents/files/96772519767.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2753248321.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090714001173499.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/liruvubako.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/werisomupeju.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8kvrdvk9m9kvkooahprtbsqth3/79581996188.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/64371225136.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137764a410a5---waronusujel.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/72511061706.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/76316520684.pdfIn PDF document text
    • http://dongphat.net/upload/files/bijexowixumupove.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/fakofelipowibagalijufixam.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/93239488561.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/nogot.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/paxesefatugobebo.pdfIn PDF document text
    • http://newcityhk.com/userfiles/bavobolike.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/51867132878.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/wamonivutakex.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/nuvasibekuguruguxed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gta+5+free+download+play+storePDF 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_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 18600 bytes
SHA-256: 0f2f5d1538410de9b684790d0cf6567002333b43bb8e0267055f448dc668b9c5
font_01_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 10772 bytes
SHA-256: 34276ca4159895d766466cf4119f2b38049913b1a541b1fb0a565e4f24ada204

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