Malicious PDF — malware analysis report

Static analysis result for SHA-256 759eee4c9fe8d4cd…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 08:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2e99e187e891ebfcebe9702b0c1f6d9 SHA-1: ffe84a4241f2acd59297774a1ebb5f1df6bdf6c5 SHA-256: 759eee4c9fe8d4cd92ee270583d33e0603596530d4cd204881e9ba18960623dc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://varadimasszazs.hu/uploads/files/ditutarupoxidewomikimo.pdf In PDF document text
    • http://lg-palette.com/upload/files/47438921637.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/8520923264.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/59630389436.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/vorelefudu.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143acc00dd94---66423956775.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/gewapuf.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/49789721865.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/90267489903.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89233486287.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/bediwev.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/60304934027.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/79919918401.pdfIn PDF document text
    • http://candientushinko.com/images/file/mobesiromibiwunivefem.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/39802019790.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kra73hl3bptarlt7ekjp0qjh0d/67384462461.pdfIn PDF document text
    • http://bgindus.com/t/tutorfirm/uploads/ck/files/vutusalesijarulukoxelu.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/80330007024.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2a649142---jedawixorafidujupibedak.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/dolevejimu.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/1405353108.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/11444086789.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+get+past+lock+screen+on+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_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 17048 bytes
SHA-256: 0e7da2e83ac60bfd3fa7ce718186f427f0bcfd3dc3e9dcdc74725cf2aa964527
font_01_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 10860 bytes
SHA-256: 85fab09f63e52785fde8558c1bfd91e5da57e97f52d002628e37b2419fd53a3b
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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