Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da1c1e0cb32745d…

MALICIOUS

PDF

70.2 KB Created: 2021-06-20 23:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cb7a5491ef61a6a1ca5ac4f5adb7e05c SHA-1: 78bd1c3223e1e6b4b99fe230ed45210a86f28d4b SHA-256: 9da1c1e0cb32745d53b31419978d134aa7b684e12fe2168a9bdfa563f7df4aab
204 Risk Score

Malware Insights

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

This PDF is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it's related to PDF resizing, a common lure. The presence of numerous links to compromised CMS upload directories and the 'Password-protected archive handoff' heuristic strongly suggest this document is designed to trick users into downloading and potentially decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/5i4ro2tfrlmb5arkgj9aolvckp/kaxujiguberetutaxuj.pdf In PDF document text
    • http://dunajecbiala.pl/upload/File/9669691583.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a9d6588ef18f2a1d94e19207ab382482/70110254589.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/84441456880.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/guwuxamidolapariroxatax.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3551217c9faddc4cacd87f0265127c58/4963391338.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/20a1nue52psov0nlksf2oe3e67/rawasufonumunojugunuvelel.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2ad7fc54---lapuvoxubixazewitobezol.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/d490219ffcc0b9e6642155e6b9f502e9/dobame.pdfIn PDF document text
    • https://avenue102.com/uploads/file/37938217560.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/68cv4180qhs70il0u74vo81mbh/nunanofewapinexukepumu.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file/%5C/2021061501432518.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210513230344940.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5d51a8db---zixilomekem.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/18283969120.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ebb157260---52937799547.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c98e5cd5c4---gumevasaw.pdfIn PDF document text
    • https://kawanmto.net/contents//files/sanufemope.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc5cce590---burejiferapuzilug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=online+resize+pdf+in+300+kbPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 5412 bytes
SHA-256: 44bcc15da8696977729fe7608f7021c5ef411d87947756f75e72d67da365be26
font_01_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 11128 bytes
SHA-256: 90d4b163df7f7be58762751b07f4c518ae9ed325dcd5a4751a1add9fe9e43d74

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