Malicious PDF — malware analysis report

Static analysis result for SHA-256 692f6fdb09cd4349…

MALICIOUS

PDF

83.8 KB Created: 2021-06-25 16:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a404fdfbd1f5a01a97a5b21c18d0d3f9 SHA-1: fa6b0855a74474a3c54285d9b5d5120f6c3f6cef SHA-256: 692f6fdb09cd43497bee5c3397fd0a9bf0f729bcf21b74d55275b1cb0eef7628
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations. These links likely serve as a lure to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a365807d648---45244027970.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c3f62965---20009727290.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd9b657f1d---goxusemifotixex.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2c4b26d16c2a4b49e021a064ed3f422/92302986346.pdf
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/52524286791.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/74470037011.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450c02623f---19131497659.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904db8e62ae---pogasuzuzobijovaf.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/519473db470b7392e0ddbcbb6a00a531/24903748215.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094476b3f17a---geniparuzusawajopovesefo.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/ehl9ml712bjhsqdkukugph7lcf/77325979666.pdf
    • http://nhadatv.com/webroot/img/files/jipukujapofu.pdf
    • http://mazdooradda.com/userfiles/file/bibufasoxu.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9084ff08493625c56b0cc3f7479bfcf0/kumopezajiwagesojemonejam.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+check+instagram+messages+on+mac
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ad.bin
79aa7308ad7d53d7e108b752116241989a1b350eaaa554b85fdfa8543d8c6415		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 10800 bytes
font_01_sfnt_off0000fe77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 16792 bytes
font_02_sfnt_off00011689.bin
f5d14a936a5630e4338b33491b038a797ad980785971c6638d6b2eb749d06f05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 16760 bytes

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