Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6db2f0278206a5…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 10:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf85f24fd73862a890465ce00730b36a SHA-1: 5c5035d12325976e6f0217b3c92dc2e875fd6448 SHA-256: 8a6db2f0278206a5518e25732252f053b24523eb83cdded32228c99fa0f49530
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it's designed to host external links. No scripts were extracted, but the overall structure points to a malicious document intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=where+will+promising+young+woman+stream
    • http://www.cottagegrad.ru/files/file/22433415441.pdf
    • http://firesecurity.sk/userfiles/file/zisameloxemasabotuxesuk.pdf
    • http://www.findvoters.com/userfiles/file/78054739943.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/rimabapo.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-9-7/20210907123527435620.pdf
    • https://electrodomesticaruano.com/images/ckfinder/files/nexowex.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/xutifufunomenin.pdf
    • http://xboxheerlen.nl/userfiles/file/2331184604.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613139b722974---38454675257.pdf
    • https://pavillonwohlen.ch/userfiles/files/92962385714.pdf
    • https://i-try.tw/upfile/files/2021/09/03/manexusumofo.pdf
    • http://bayanairag.com/uploads/userfiles/files/fexot.pdf
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/demunojore.pdf
    • https://dveropolis.ru/upload_picture/vesivusepoz.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eee62e671---19918346618.pdf
    • http://pjteam.hu/uploads/39314641515.pdf
    • http://jingluo.net/uploadfiles/files/gunomaxijese.pdf
    • http://murasakijr.com/uploads/files/43846468379.pdf
    • http://matchedtubes.de/userfiles/file/tidofadigikoxixerarav.pdf
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/67409824556.pdf
    • http://aotwresort.net/ckfinder/userfiles/files/fegivi.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139141d7ba87---30385831512.pdf
    • http://allier-genealogie.org/File:/fixapuruberufe.pdf
    • http://ahzycw.com/upload_fck/file/2021-9-9/20210909185228152897.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_off0000dc52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 16792 bytes
font_01_sfnt_off0000f464.bin
931b0d3bc17a4dbb2442f41796c419de74da4665e0863408b0ca9ed52e78cc0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 18740 bytes
font_02_sfnt_off0001254a.bin
338969ffa9855ba96f1a61c5f5fa168cee460c96c10b82f64da4670e3a63fec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1254A 10992 bytes

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