Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a768e3d298302d1…

MALICIOUS

PDF

83.1 KB Created: 2021-09-03 05:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb5c86e4712cc4b0ad83b5b4486a5f84 SHA-1: 6a81d2da2868835a2cb8b9e4e0a6f5a620971cbc SHA-256: 0a768e3d298302d13cdae559f1e87753a088e614b95e6e1dbf329c628c922f21
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised WordPress upload directories, suggesting a tactic to host malicious content or phish credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fertilityupdates.com/userfiles/files/matigawimaragibur.pdf In PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/138925391060a1c3e965090.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/41685840072.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708411c561b---nopifibegoxizudokezife.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/76146469704.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a687ea4e5da---64624771237.pdfIn PDF document text
    • http://pasted-radio.de/web/files/zetoja.pdfIn PDF document text
    • http://jsdarvin.com/files/7525990401.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/6nv8hjkqt7f4k9if1fi94lgh6j/28372148810.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/cccb88006730bd425249860b1e96a390/nafitabu.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/83112622049.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/fcd8ca2339627f745bef673e21e77247/29074925919.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160727b11bc5bf---kigeroz.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/7a68b6d36b9dd654c3d1f30afd6c04f7/40496636713.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/jopaje.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/gefumurav.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/bukulabilugunelo.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wevawisexotukixo.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b7911b6855f64146369e9467c8639fa0/soxubuzavagerupi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607000046a137---gigepisiw.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/72bbec818852f9dfca0e21fcc7126c31/pomaresezudepiwixidob.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27561526e---kijawasuxewuw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16121a966717db---wewukifuvoja.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5uq5e25bnqe0koi00vimkdnpj4/49929221101.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/kaxomegiledelizidusuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=enhanced+defense+cooperation+agreement+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 11004 bytes
SHA-256: 33907d7d656b43616197e3992c684ba422671af7621b20500dd567f683140dc8
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001107a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 17056 bytes
SHA-256: 6030799ec1f81714c8afa7bf08de2531ac99a29cf220a5039c56f62f1e505543