Malicious PDF — malware analysis report

Static analysis result for SHA-256 51591ab0f6e3bf78…

MALICIOUS

PDF

208.3 KB Created: 2021-06-11 07:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a568c2c11552ccc30f571ae569435403 SHA-1: 86245f9e29a9e27b38ad2e9348e16695ff4c67ad SHA-256: 51591ab0f6e3bf7876436b69ae345fb1aa9c0b9f714d06e2de59a249cce48457
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple links to external resources, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggesting it's part of a campaign to distribute further malware. The document also employs urgency lures and mentions password-protected archives, common tactics to bypass security controls and trick users into executing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=five+little+monkey+video+mp4+free+download PDF link annotation
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/eb2a4c007f08e219fe371d67b3447e04/kurogivituto.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/014148ef0b7102a306122d440bfe8f9b/jatosonogalufijenu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/c7a83df425112ca171c9d394f703bd87/fovese.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a944e006a81---29467108727.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/kowonulaxo.pdfIn PDF document text
    • http://bakoca.hu/files/file/zuguzitowe.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/wamojisufarusijaj.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61899205fe---pamizotofotufufujixolegi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa54f8921a---32866037643.pdfIn PDF document text
    • http://fructusartis.com/i/File/77534047189.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/7093239427.pdfPDF link annotation
    • http://laiyi-art.com/userfiles/file/dotagojan.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/d2asiaqmqbvcu8rmfpv3q4glc5/pofubidura.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094360c40c64---36897262208.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ve54up0q0kf79adg1h08q8sui2/56758620778.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/hk6tf32gdnft8fomo5ch4j9tqt/faruzodukuvaxupujegupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0002def6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DEF6 5592 bytes
SHA-256: d8a07d403edc9a6d234a95e3e620d0acd663760633581fadcfbe697a7259d296
font_01_sfnt_off0002f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F29C 5372 bytes
SHA-256: 2aec0ecea92eb9b4a626e1860c416370870998f3deac3c9ac8ca24d533fe38ed
font_02_sfnt_off000304f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x304F9 14128 bytes
SHA-256: b7dbe55adcc4ce41dcc097054b3c526468b0522f4c489790993a80214f0b889e

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