Malicious PDF — malware analysis report

Static analysis result for SHA-256 28029f5953669fa0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 17:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f94742b45a9ec8b90b1d6d177080ad6f SHA-1: a686e48e52f6a3a80c006ca9a622716b8828a0b2 SHA-256: 28029f5953669fa0665ce378cee8a36cbd28f405f5b925e6bf27cfff316d56d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful content.

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://medvor.ru/uplcv?utm_term=problem+solving+skills+assessment+questionnaire+pdf PDF link annotation
    • https://thefertilizergranulators.com/d/files/masovawefirinofim.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/40faa1fa07f7a9b6c9a6f55d9d7dbb0b/29076076129.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8f95fe15d2a6ad57c64bb268d02295f5/ximepadegavopexoxolepov.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29a3c77a3---99261831938.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/95044233170.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/2628791116.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/jabapekasazoj.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7e7ea7757952e5c59df4fb55c8f576ae/16283642297.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5873be9f3---51811315876.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/nefivogigise.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/96468327823.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/55079863064.pdfIn PDF document text
    • http://ashioke.com/images/library/File/73556791017.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-22/20210722233036626152.pdfIn PDF document text
    • http://nessium.net/userfiles/file/93724189533.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/48045702887.pdfIn PDF document text
    • http://funperm.ru/content/file/21419968703.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/1354656132.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/1066f71a3487b0959077b66c27895c26/mumode.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/45076461292.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/fosugififikasa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111f6c33446d---64000473713.pdfIn PDF document text
    • 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_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 17960 bytes
SHA-256: 0f5cbd346948b1b6e4a5989ea3d0dbaae407a2f4a30d1c39b759210a28e1b9c6
font_01_sfnt_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 11388 bytes
SHA-256: ca9333be1946a6c1782e6f79fb66b1205aad2f8c2efbe8b3b0a637b44595b8df
font_02_sfnt_off000116f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.