Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f11d31fda37966c…

MALICIOUS

PDF

79.3 KB Created: 2021-07-18 17:31:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ff1a13316a468aed68b31ea76f24023e SHA-1: b127c7c7c91fcd5938c634268db851605874c04a SHA-256: 7f11d31fda37966c0e16f357b9821f7ca2b34ece1aff20e52a3ef8f31aac322a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics further supports this, pointing to a strategy of redirecting users to potentially harmful content. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f4c48d0a3---23653967114.pdf In PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/cf48f4ac6eb072c183e77fb56a880a17/malajuxupizosaxowi.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/99976094965.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/79626657690.pdfIn PDF document text
    • https://bloomeng.com/uploads/kolijezodure.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/94999263968.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/lemuzexavoti.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160706b344b7aa---70758142756.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/50668206308.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/84d76e1e1721dd7d4e7baa6b61e2b9a8/wazovofav.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160873d70c9f49---72334051660.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/lasofowevizomeki.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd30013013---48183554230.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/5cfe1ebc6304b56061960c8643e10d15/fuwudemavaronaxizeb.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/5987880889.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/zideteworavoxi.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/a5951044ed680e3f8197e2a6ab6a405e/12693500493.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50139f2e0---wuvufejesatuxadotefojo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5715ed04---zugufivar.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/24529344171.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4f52d7d3f---79268189633.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/7998c4459c8c47f2997101c035e9b002/19297731283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=example+of+final+reportPDF 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_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 16516 bytes
SHA-256: 47b49a939875c45e14f2f696ba82934a0114b6462ffd51d442ccf8037021f49a
font_01_sfnt_off00010078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001188f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188F 10436 bytes
SHA-256: 6356b255a506f31bdbcdffeaa6d04478f059c0d188c0219fa1ad49d9cf53fb4d

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