Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54d5a640b938685…

MALICIOUS

PDF

89.2 KB Created: 2021-07-22 21:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b88868a560949fa545a31cc26578c19 SHA-1: ab08d4d86a9d842bda1c250a2fcc6daa2bd78dfe SHA-256: a54d5a640b9386853af82e21cc9630079c419ec903d843a0152b0114190e51d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised websites, likely for SEO manipulation or to serve further malicious content. The presence of multiple distinct hosts and the use of disposable hosting services suggest an attempt to obscure the true origin or purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://ballstonfamilymedicine.com/clients/861402/File/73762762985.pdf In PDF document text
    • https://123natura.com/stockages/files/9855193558.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a5814b7e9---1416731123.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f8064ad1a---gugalewi.pdfIn PDF document text
    • http://epicridesnepal.com/files/xolafipuz.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816d26a22f9---gefufepijakajo.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/wesupamozufo.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4242859ee6ae71ef6b6d7ae05d3d028b/sasawidumib.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/33767631548.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/83hjqmoo6o98774c2mmt4r9evh/40416003145.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/88e2c11a1b451d6baad6c1f8090f5da1/68631565205.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/mofariworuto.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/bezusosalodet.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/tevolo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce6eaff77---purevukufu.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/38524400128.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/81609273359.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/79684d798c0d91cfe16fd8f12b5c08e8/bugibi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8566e65e5---kumulupagofexoduko.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/a7b4f6fefc3d53a189290a476456f299/jironudo.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/7cgrhjdkcvb5d7npmkjkg85voh/32182989503.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e68d44b2---gomidasupidaladuralunos.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb24f24fa84---53896534365.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/supipuditamenigenasiza.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16083c049be63d---64928578141.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7edebd89f3---xapekemaxaporixari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=romeo+and+juliet+nurse+character+traitsPDF 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_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 16852 bytes
SHA-256: ee5536f191f3a46b6936548796bcfdaeebb026e41570603db6eee3bfbe126b80
font_01_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D28 10912 bytes
SHA-256: e49013f0affcf4d9f3cf118d23b49f19fd2187ae8ffab36e8504afe8b05e244e

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