Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fa04609689c5b6…

MALICIOUS

PDF

94.3 KB Created: 2021-07-02 13:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bc655eed1d0c94d6335924e410293b89 SHA-1: c1ca556c01477c87acba62a9d441d6daecfe6231 SHA-256: e6fa04609689c5b68c398c139b552dc3427dff99f02cfa7241e5f94024877c6a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a69055186---39620030873.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d994172521---pogil.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/33545318405bca951a97c608e4606f0b/36623339693.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd8bb8444a---49473788317.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/tikag.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/vakeranavojafav.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/20a62cd66d018fcdadbf78bb5408f32a/visufekeli.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bd2a5f32bb3e64806194cc68429c23bc/virozivuwabodazavidaxu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adddfd3a8ce---22608038888.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/bekafebomawowamemanegotib.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a630b07a4cdfc0bc350fea5d7d70d6ae/82343507747.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5onnpnhn6b3m9boalp4a2g5gj2/75810461514.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/82382689326.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/vidupemoxoditorikewe.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43e0e47b4---35627757563.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7283503d---15791168860.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/rapalozerugegodexemelarow.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pdkqqfb5potod0dp69ek9h9687/xovofajeguzoti.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cd280c363---golomolobizoxas.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/19749bddaa765124c93ffcf208c39a3d/dirarerokilipevegi.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/53090674964.pdfIn PDF document text
    • http://babamoleskine.com/files/file/bimulekepuxuwewumademu.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0300f00d6493b1e9073dc6dce2f643a9/pavoramom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+going+well+in+your+job+answersPDF 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_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 18048 bytes
SHA-256: 84b9a3d1e71fd791c779a9bf0ed8b17fb34905925a666747ef09deab7c75fad6
font_01_sfnt_off00012242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12242 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00013823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13823 10948 bytes
SHA-256: de91fc87966797e037129815ce2b614f73aeea1e16efb7d4481ef1b8d50874a3
font_03_sfnt_off00015185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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