Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad1115d2e70d7f7…

MALICIOUS

PDF

111.4 KB Created: 2021-06-26 17:37:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 962b65ff33294dfdc40dc375d1beb57a SHA-1: 6b36be62bc40e61ed558ee1bc5e55a55e34206be SHA-256: aad1115d2e70d7f7179a54309b423161437065ba94d28f25e7a295315e5ca48d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and a link farm structure. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cructi.ru/uplcv?utm_term=sarbanes+oxley+act+of+2002+summary+pdf PDF link annotation
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/9313532134e3f7a52763d2275be576f2/72148694657.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/sijetilojudedidozexuladep.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m7dt93a5fclh85paat02abp8bh/10863305973.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/71559596483.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021053016473673499.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c10cb2ef---64651764996.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c197cea1b2---40125473812.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/04df1cc2616459aaa548bf7938e1863a/48580223395.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ee94989e401cd903dc9ad0cba1baf2d9/sugijogajabagazuvirirow.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cee46a20645---mutadujovasu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f628e4fde46f09c0d9d51618b95b5958/15421523485.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/33aed3d649e76355e4fc1cead267310a/podifogodufisikajuxomizi.pdfIn PDF document text
    • https://okvino.it/file/fupazetisupa.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b58d6d9052e---14971815635.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/be3b25802ef1a5733b3bbfd4c62e43fb/98051307868.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5c1e2894---90697500828.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/293aa37i48hifv4l06hgih0lt1/vigotadatemapatovijuwufav.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/r6gantt0dca491vin3qh1iqlv1/29945791090.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/61291191305.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/29d46a6b05758a6f31498557bf67c8dc/9855423625.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1b1bb89d94fd270473732e00ec5da9a3/33295591232.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/zutumixi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g7gc4pir3n5f90bkaon205aph0/70221954350.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0A 17756 bytes
SHA-256: ec3eddbf173e65a007423ad2a51e9322a8e7d0b4b62ef2469ae154429fb58d3b
font_01_sfnt_off00017d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19591 11464 bytes
SHA-256: 04bb1638eb994148b7aa6a5583e7ab931fa47cd4448af8957bb6ef7d17812372

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