Malicious PDF — malware analysis report

Static analysis result for SHA-256 4426311dc86f622b…

MALICIOUS

PDF

73.6 KB Created: 2021-10-01 07:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5b603ad07482f1c936dd292e569d7d0e SHA-1: fff81b0b991f0e4db8e372f1aeb13c0e7cffaee8 SHA-256: 4426311dc86f622b12c3449f0805ecd5c7c00b941498489da74f4d4034b2a927
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics further supports the attack pattern of directing users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=sonic+adventure+7+gbc+rom PDF link annotation
    • https://qpshouse.com/upload/image/file/20586077342.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/4754100437.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d79b74020---30365113212.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/94622258405.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16144669ea371d---82236861536.pdfIn PDF document text
    • http://www.moyekolodin.com/files/96064703741.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xodasamatuvilafelolegelu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161563c6d54149---85726636026.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/7917411675.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ed014c012---jogiregigepuri.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/vulamufebawowemimiwox.pdfIn PDF document text
    • https://mandaljeebanking.in/ckfinder/userfiles/files/12477666865.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/pojulibuxewuxowegovibuxu.pdfIn PDF document text
    • https://alkoplast.rs/files/sixopanofi.pdfIn PDF document text
    • https://alev.az/userfiles/file/68199111053.pdfIn PDF document text
    • http://prosquash.by/data/42869687462.pdfIn PDF document text
    • http://allier-genealogie.org/File:/52777554793.pdfIn PDF document text
    • http://netflor.pl/upload/File/livotofebatasej.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/medugatowulubusoxamotuj.pdfIn PDF document text
    • http://qdjshg.com/files/file/98565692334.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/8728276580.pdfIn PDF document text
    • http://vititanon.com/user_img/files/98260649326.pdfIn PDF document text
    • https://pcetravel.com/files/file/85936441373.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/84441314217.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132629106572---minifapomipewefibojoboke.pdfIn 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://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_off0000b710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB710 17832 bytes
SHA-256: 2f960061310ea0292c95a3866f9d1c38860c25ef896b7e6fde35623b8601c33d
font_01_sfnt_off0000e59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 10932 bytes
SHA-256: c0db890fd3aa37fea28bc23a9c8578183fbcb659e36764d5fb05d656b1b9d909

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