Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f56e4118e5ca18…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 12:32:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d27b970486a216c1575f4c4b4a9570b8 SHA-1: 0a627dbd7f8c6199e68d014d13d7b544b87a78e7 SHA-256: 91f56e4118e5ca18591b517090e4453953a7f6b2e1179f22141042bedce07dda
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful sites. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://babyindex.nl/images/uploads/40235950134.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd1eeddd4---52463493104.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/56665711162.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fe4610b8a2db3d1fd615ca88cc101186/47461497206.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7cdd551e3---vuxixinogetav.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/93612162716.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/4e79faa16dfe76597f9e6effd850d495/41593448632.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/gukifetutufipitit.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/vajanijovolovedixu.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ahqmj62pi3alv0t75a1s9f67ug/36717312915.pdfIn PDF document text
    • http://jkohut.pl/file/penomivozom.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210706_121743.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/1938260946.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/74436369838.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/sapazibibe.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/db8a1d6b0b4ffac1b82fb455c2b407e1/nowiwidesasuwoguluridad.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fd2de354e3d69871004448042aae956d/nixatugojufik.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/30517733232.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bae7b345e---24556895921.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/ruvug.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/d6e17de078ee0acca7fec879d652130f/jemoteferibiza.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/53108427479.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/e3ed4b73ecc4d86de82d5962fdf73821/wizuluwenanovapejasefoxur.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160703e40d54cf---15417483855.pdfIn PDF document text
    • https://bselink.com/userfiles/file/kuzowebow.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/d3327143e39f47b61c6f23ca5d363bb0/bogifatifixoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=regression+models+for+ordinal+data+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_off0000d905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD905 10884 bytes
SHA-256: 45de533c48ed26893d7e299b9010d9a74eebe2fb2abf4b1fe211cccd2436de94
font_01_sfnt_off0000f1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 18100 bytes
SHA-256: 17257825677aff2c657b5dd0a1474303ff391b0c4239c4c90c00e04a75b3489b

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