Malicious PDF — malware analysis report

Static analysis result for SHA-256 997ee63ca3238b6b…

MALICIOUS

PDF

152.7 KB Created: 2021-05-03 23:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c70fef8e1cb76bb500e6bf5851dfb380 SHA-1: 3986cf3cf2c68b8abcbfd977e87ab64be8c2cee1 SHA-256: 997ee63ca3238b6b4e1010eed6333f29bd5f334ee91059ae17cf18335edbcb1d
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to either poison search results or direct users to malicious content. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b6c161bf68304d18d4808dbc0ce24469/96125519212.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0255e15be---woxog.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/dd1b9471e711ba64e9d0230380451196/pivekifugopebumu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ea2a4b046---23850463613.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2cd0f9612f57b167497bbbd8224d20f4/zapavifud.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/02mdstk67o8jai9pqh9qr7bta3/lukimowipiguvolalogijela.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc88886ee9---xuxukonu.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bccb6e3dbd---dodibeben.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tl3u7rregtcpa7q7l5fgotikk5/sugugej.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb3352756---konot.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d00d55f4.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160749ad257de2---39888459771.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/1b3duc24e1ujt9iftgjibdocuf/91469546437.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1960bdf0e---wosugamemeratemuwax.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/mubuwekuvojadujirimiji.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16089bbd14be86---77820616603.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072abdf31715---31145679605.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=smd+electrolytic+capacitor+datasheetPDF 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDE1 5052 bytes
SHA-256: 17ded8174c17d4e566a8e69a2e7a04518d1d5feb0991b03af923df9eb3af7e13
font_01_sfnt_off0001ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF8C 5200 bytes
SHA-256: fa1c08d62dfa1b736bc5696c25875362634592eb170c78b066b11c7d0ef225c2
font_02_sfnt_off00020132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20132 15000 bytes
SHA-256: 8a53a3eab4a38355fe1eba768e39076a27896daaa92a118fb9e50481d9ecd82d
font_03_sfnt_off000231b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x231B0 16064 bytes
SHA-256: 8407df14a2738efe3d2aaec449fc7b67f888222f7621c5c094f7d2f3a91843ca
font_04_sfnt_off00024651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24651 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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