Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff09565d6bc61a2…

MALICIOUS

PDF

95.9 KB Created: 2021-08-03 09:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e820ebf2410ea8a2ae9516aad038c5d7 SHA-1: 17032540d2c43ac217f698c0a89679b9612fc01c SHA-256: 4ff09565d6bc61a200876715467855bf3783f5d35203a9a356a31f18c4b946d7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links aligns with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.aluvascientific.com/UserFiles/file/84599286221.pdf In PDF document text
    • http://rheumatology.institute/upload/content/file/90784369014.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/7716400312.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/sojitigukalug.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bfufehnls4cuq65v9v27mbnj4o/90231771877.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/7946392760.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/dabarisinuduzudebibipile.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5tmrns41qsa7cl42m1uhjl5so3/xuxebi.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/lesaxo.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/tobusuvazoduj.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1081d195---67608918720.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/refusazurifalinopasagilu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3ece01b09d6029b46e0d0a7fb38c77fe/zumekidejifesumosojap.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d291c5d837---95846127061.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/fagefowus.pdfIn PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/sabup.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/79a2a44ad5a5647b65a3004355a9e685/lelovetiwasopip.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608778cfdd04e---misufegati.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/507166dbn98ld9j50mf9k5mqgg/62946647166.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/lca3i85g2j3j64grid3k12k8io/27502849377.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/wijizomolegarasafiximug.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/8312267154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=terraform+resource+aws_customer_gatewayPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 18144 bytes
SHA-256: a5be040ca5805be1916075f9b768f906e66fa7ad06919c62fda8958631de881c
font_01_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 16676 bytes
SHA-256: ace7ad2ee47d5550e3a6d6fd689de0ac4fe40f8b853a08ed99822cf0f8d61ea5
font_02_sfnt_off00013f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0A 10732 bytes
SHA-256: bd5c6bef4ce747f9136f574eec68ce7be43c743d589d96355408bdcae18ee7ac
font_03_sfnt_off000157ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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