Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a53b7bd616c566…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 23:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84f6762461a3f74ca3b00f19b4e5806d SHA-1: ba609dd8fceb5da4fe05b117502949942af56a11 SHA-256: 19a53b7bd616c5665cba1fdcf1fb13de90a51da7260977857cbc305ca0c1fd3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The presence of a link farm pointing to compromised WordPress upload storage suggests an attempt to host and distribute further malicious payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161458255dafb2---99287780139.pdf
    • http://nikolalepojevic5.com/multimedia/file/kajodam.pdf
    • http://abnigakgdsg.friendship-match.com/upload/files/37305983510.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/078568d4fbe737c592abbfb110469bb7/suleb.pdf
    • https://cobaltinc.org/userfiles/file/79457011152.pdf
    • http://kamennykoberec.eu/editor_uploads/system/files/96406180913.pdf
    • https://mimpidia.com/contents/files/norepipukobata.pdf
    • http://hud101.vn/webroot/img/posts/files/bafigenememawesupenokatuv.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0f1f17516---39345441330.pdf
    • http://hzxf.com/images/upload/File/wunukivud.pdf
    • https://laetitiabernard.fr/images/file/16759015624.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/mukuwor.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/fibafeb.pdf
    • http://the-bom.kr/upfile/files/vigejitapulo.pdf
    • https://omegaplus.bg/uploads/pages/files/linajifaj.pdf
    • http://spaconsulting.pl/userfiles/file/xaxeburasevizosi.pdf
    • http://www.predia.cz/userfiles/file/vibilenepologiwatuduzize.pdf
    • http://denetimmusavirlik.com/userfiles/file/61899534293.pdf
    • http://vencedor.coop/images/admin/file/penopujunezo.pdf
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/5755046860.pdf
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/fejadomugepakizito.pdf
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/mirin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dragon+ball+episodes
    • 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_off0000ade3.bin
aa3e13dbf630689b1e2e213a378522efab4d5b036ab775bdc110a90f16e79d7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADE3 15180 bytes
font_01_sfnt_off0000d3eb.bin
bc3cfba90226f312179fcb30e87639be873f98d19590b6cdf85fe56c6d136104		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EB 10608 bytes
font_02_sfnt_off0000ebc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC2 16792 bytes

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