Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da2f737d091ba08…

MALICIOUS

PDF

74.2 KB Created: 2021-08-19 03:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f2103a962acfd2a6f23496bff268510 SHA-1: bbe6de97121b008ffe1b8b694dd751ffc8366836 SHA-256: 1da2f737d091ba08926bcf417f8fcd28ca90d6d93ea2742d64d52c253087b6d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://bank-kredit.at/ckfinder/userfiles/files/susisofupakabax.pdf In PDF document text
    • http://sxhk365.com/uploads/file///sofofamegepukotikeko.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/37608375744.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/42221068260.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/18270879136.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/boloji.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079ddf23c703---modamoririwimojada.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/xiwumo.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/91497412364.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/57248cd48d6b8f0e68f5e8932cea1e7b/rujunuxotudod.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f161cda943---dufavavupawe.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202108030352348091.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/xekinidemudosesaburawok.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca906ad083---40210268775.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0c7f0e7796---ratigilisesukuvafekujur.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/llvanugojasvnuj4tn9rb0tif0/6490038719.pdfIn PDF document text
    • https://qnzar.com/files/patepamolarag.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/netakefaberanogodaval.pdfIn PDF document text
    • http://museeducuir.org/upload/files/70051654609.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/tovobijeletixawamemuxi.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ltugo1htikbtkec0qtgmc1ubqv/makilumiva.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/sidejikobedajozefi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afd86fa5d69---murobop.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/7770093404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=bridge+to+terabithia+2+full+movie+123moviesPDF 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_off0000bd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD39 16736 bytes
SHA-256: 70405d904a59487c72914800d523952b2e9704630a5ceba9f4afdbbcb0e890d1
font_01_sfnt_off0000e7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 11400 bytes
SHA-256: 7a9a30d906f36b65fba98f551dbd236392d18e5e1bc4e14ae73382c715a26a86

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