Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4a215a192f86fa…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 22:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 58c4d7a79d3bd816f92bc070fa68899c SHA-1: 764ade62a5ed05e4e421c56b392763689f07e0c6 SHA-256: df4a215a192f86fa9d5415db0846d86169271482f6a6dcde6c174c4a65f804e7
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a scheme to manipulate search engine rankings or distribute malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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://amd-export.com/site/upload/file/lezusunuxubuvinukodes.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/novadijefeno.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3f5b2pnn53kbr0m5lu49emu713/18948241977.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/03608883bbf6e51303c574b30fb22114/51083198321.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/70052292567.pdfIn PDF document text
    • http://juentai.com/userfiles/files/71121085122.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/pibabenatome.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/xefipelukusaletoru.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/5062188512.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/91780789528.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d1bba87f5816ef49498d162200c5212f/mitadizurupagafi.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/29536715818.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/88rhn7skkrn4e5pauc3sohegj5/68273005553.pdfIn PDF document text
    • https://medtek.vn/storage/file/13139122234.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/suluko.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bc87f31fd9b---29145151727.pdfIn PDF document text
    • http://mprime.net/ckfinder/userfiles/files/zunuluvoxadutonesofoji.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/55656856931.pdfIn PDF document text
    • http://cocoal.com/uploads/file/xuzijasixevoxakebibopus.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/rinapubexotubuje.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/95694855365.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=saraswati+stotram+pdf+in+englishPDF 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_off0000cc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC36 19900 bytes
SHA-256: 08997911ec9ff61963ca01dea43e89d62768980e132f166f61fff37e57a73009
font_01_sfnt_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 11104 bytes
SHA-256: d77e3b7ca6ac4d8d9c8bb760b04486ff31780e2a185a933ddd3603d4ac3f12f3
font_02_sfnt_off00011a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1