Malicious PDF — malware analysis report

Static analysis result for SHA-256 a185d47fbb1395b1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-06 07:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa99c6a7ee56cf238dd043a1463bc582 SHA-1: 93e324890f2b3f7e144824d9b33de33792b46cb6 SHA-256: a185d47fbb1395b122a817d9b5c964223cdcb4fe0449321aa861e57ca76f1d39
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the document functions as a link farm, with numerous external URIs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://kraemer-duennebacke.de/files/file/donetunaxoladagabilotov.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a76a67f0ba---62400444555.pdf
    • http://ahlhy.com/uploads/file/040800254604.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/73798437732.pdf
    • http://staractivecollection.com/resimler/site/files/napapifex.pdf
    • http://billedbutikken.dk/articlefiles/file/wipezi.pdf
    • http://mikomisushi.com/uploads/files/11434712356.pdf
    • https://verredistri.fr/xmedia/file/31432940234.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ed541121c---35865762971.pdf
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/fcujhi2r1clteqfiokhckd7icj/dofudagaba.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f506c8929e---pezikipubakonowedi.pdf
    • https://tl-systems.hu/files/files/61337118041.pdf
    • https://jaiminsales.com/ckfinder/userfiles/files/foxumizikuzodigez.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/lawunomuxalorufarukafigo.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/552be198ac4e9535ced85f8b416924c3/15623953795.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57362b3a1d---venutubamaz.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kols76b65fn60eh0g84e5gsl54/pajavowanijololulosijo.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf09d42f4c---60767607940.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/21841185cd6016e8f8c4d2d02e3120d5/64270032031.pdf
    • http://consulcongress.it/uploads/assets/file/zufamogisilakix.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607748b660685---1624226288.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c734dda1c---76291398450.pdf
    • http://kondicionery-noginsk.ru/upload_picture/file/kuvolugogog.pdf
    • http://liveranigioielli.it/userfiles/files/padoxuwobumuruduxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=all+i%27ve+ever+known+hadestown+sheet+music+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc8.bin
e87d6450de979b76fb5e39d64beefdd75a658bdf7e8abb83cf398ad5ebf92d1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC8 11244 bytes
font_01_sfnt_off0000da0f.bin
6bf3d344d62c1f9f1b6cce92dbf87bbad37e4afad5f4cfbea113cfaca5f5fb7a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 17596 bytes
font_02_sfnt_off000106c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x106C5 16792 bytes