Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b523c6d6dcc6c1a…

MALICIOUS

PDF

113.7 KB Created: 2021-06-28 05:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d9ecd6343d67f96f456b51ac385810c SHA-1: 239ac495c6277d157d33c975e69f979a33f64d85 SHA-256: 2b523c6d6dcc6c1acbabefa8d2593b6c766b300568b45ec064fc6f3e9a6c389b
156 Risk Score

Malware Insights

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

The PDF document contains a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and does not provide direct clues to its purpose beyond its structure as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607534656fd66---tenurepefonidawuxelewanag.pdf
    • https://weeb.nu/userfiles/file/69741635108.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8b492ad3---migijizomil.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/25b50a6dcdb39abdc6d4f53e515afa12/44045409324.pdf
    • http://armanetti.com/images/murepunixige.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/8401019277.pdf
    • http://salkim.com/userfiles/file/99455460976.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0705a1bd9161a83e228092ac0dbba417/dezojawelefokamodora.pdf
    • http://aeronautike.com/userfiles/file/zujidijuwenoxowexefugowid.pdf
    • http://atut-biuro.com/uploaded/file/bunebizinas.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/javiwunasivagoxeg.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088a363e9ce6---wokotasuvilajanag.pdf
    • https://ctners.com/ckfinder/userfiles/files/85338257607.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b306605b033---51152179072.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b164dd3db7a---xabojabubadukerokulatud.pdf
    • http://diversecityuk.com/userfiles/file/28398185937.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a901caf08---98525273928.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/rmfmunhfp3hr34nqf3ct676rel/vegugojijinumiwivi.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/rakogis.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/mokonirawokewakakob.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/b4f071e88f31c138a60c604dfbfc69cc/82278085377.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607076e4bfb80---jinisufelof.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/dasuganokowepaleve.pdf
    • https://heatingboiler.ca/fck_upload/file/65065763378.pdf
    • http://accessiblevehicleservices.com/userfiles/file/vuvitugos.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/eb6fa2180f68926154ad8517e442a37a/70801449087.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+many+playing+cards+are+in+a+deck+without+jokers
    • 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_off00015c86.bin
056d3d9b2f2d2139a045653ef57f6c00fb500e603a9feb9ba184d2b0b1f686e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C86 11472 bytes
font_01_sfnt_off0001773e.bin
b0373250edcc444294867f6953c8087ba779ab04c40840e24c345e4e191c8d40
pdf-font-stream PDF embedded font (sfnt) at offset 0x1773E 16260 bytes
font_02_sfnt_off0001a10c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A10C 16792 bytes