Malicious PDF — malware analysis report

Static analysis result for SHA-256 22899d67007762bb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 10:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 169def6137c1d9a6fff49086a0717006 SHA-1: 9bc8add027b0692525a5c95944c69ef974811330 SHA-256: 22899d67007762bbb8f1e1a2c516cfa8b7e372286b667663eb58b0b59ad5e4f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading further malicious content. The ML classifier strongly indicated maliciousness, and the heuristics identified it as a link farm on disposable hosting, likely a lure for phishing or malware distribution. The document body was heavily obfuscated and unreadable, preventing a more detailed analysis of its specific pretext.

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://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3ddc29aec---dazamuto.pdf In PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c417e95ce---semumaler.pdfIn PDF document text
    • http://fpole.ru/sadm_files/zupisokukarenuj.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6266d8107c1139568aff8c8ac49fc3df/redefovetubewasobevefor.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/e67dd804132657cd04a23043ad4fda53/depodeduzave.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/96686213515.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8c70cdb7e41930bbabc3fa66ce858b78/taxes.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/vakobisat.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/12272293365.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3d8b9405c---25169317867.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612e47da7d1d4---xakaxitapuxiziboxute.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nogubepirigonemojidokijur.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/20931248191.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae01d0d5ea---pifutexilonafidek.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160d9157de47d1---vegunavokuganujelagimiku.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/h1u2bmt0iqov42f21a4pl33kll/sedex.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/jaxar.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611580645a472---25056298377.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c19dc4a1fa1---44614972215.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021073000575373499.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/59821664452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=application+form+for+passport+pdfPDF 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_off0000c6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 16108 bytes
SHA-256: 23c2f7ce7d22416bc4a8f84a75ff3bd6609c7510e73c27b48d34f9cf27156819
font_02_sfnt_off00010804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10804 10632 bytes
SHA-256: 45d43befcadf0922ac547f280ac088fe2a6a1f8b742a28b2377679e220a2375a

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