Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f50a77f7108505d…

MALICIOUS

PDF

190.1 KB Created: 2021-07-18 22:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7e98cd5d5a9b4a45cea6d18e698f59b3 SHA-1: e5698d43d8506d76bdd34b67c5030facbd20f794 SHA-256: 0f50a77f7108505dfbf7b04316988694d59005e58adbb06986ce3aff6229f18f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, suggesting a phishing or content-luring campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddd6a5a1bd---97642654195.pdf In PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/6aagdouaho96uomgg4gp899hkp/jaxugazuzozub.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1099b92c63---goremamofijijux.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/c549ef412ef2e5271f38c479a9fc53d1/45627004863.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/31530898011.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/zelanaworokiruker.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wibojabozalupereki.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/a9ecebaf5e0d047bd8de607919d9e449/64421302185.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/25887712273.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a49483d45de---94422161701.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3456a529e8---75717550774.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9e7d62fe454e3e193df8ada6018a0833/18026137716.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/16892058826.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f75c63833de3b056fb3343fc39c8d89e/penulofukos.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/bobemutifazixasozitoz.pdfIn PDF document text
    • https://ka-base.no/images_content/file/42472534397.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822558acda---41680108836.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc1b63b464---74610627988.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/96414643662.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/9827176b41b9a039f61974c48ff6e1dd/65736939190.pdfIn PDF document text
    • https://proxus.nl/file/55973715231.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741b6d2ac12---94859866861.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080baac20420---6703849294.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/bagesomigilisesuvume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=advanced+mathematical+methods+for+scientists+and+engineers+pdf+downloadPDF 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_off0002859a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2859A 19504 bytes
SHA-256: b4e144de6b5c201fdfc77602fd29e67ee5dea645dec7a561b96a709e52d32f59
font_01_sfnt_off0002b80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B80E 11200 bytes
SHA-256: 7f1cc6363875ca9d4320a924a749e087edb7e6b3cf5fcdf8ed6e8bf4c28b9543
font_02_sfnt_off0002d1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D1F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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