Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea271776f393e8bc…

MALICIOUS

PDF

82.1 KB Created: 2021-07-03 06:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a114a50259b47a2f8652b87ffd8a0125 SHA-1: 1d56f0401ec2b38283093565c6e2d210ea4bb413 SHA-256: ea271776f393e8bca463dcd9e59fd1cef7cfe58b0bef67e9cf68bf2c27ba8e04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites, many of which are hosted on disposable domains or utilize SEO manipulation tactics. The presence of external URIs and link farms suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=trivia+questions+for+teenagers+with+answers
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/01e9309b86030a3574ef668e54164b33/79657567072.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607983313436c---nidofupuluxababajewemoze.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6c17e3f893f9a952bcf01748692c669/suxopuxetefif.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/2d17662131ee1513b164d48d15209b65/purub.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/59462hhokf85135kqf1pu6pi5e/32806550511.pdf
    • https://muguet.fr/sites/default/files/file/mubevinezizopupik.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a706acd0e1e---86064415792.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42aa8b72c---34832458176.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/tadiwotor.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775684b5c8f---ragiz.pdf
    • https://carsen.sk/editor_uploads/system/files/72149701699.pdf
    • http://bearings-home.com/userfiles/file/20445537315.pdf
    • https://yar-net.ru/userfiles/file/66579895079.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160845c3f9940a---81526497456.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084479e41c03---8770029126.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/24411273418.pdf
    • http://trunglam.vn/uploads/userfiles/file/zisisimipamijonadodagubam.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/lizopefilitupitubixowoz.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/cfe9e2ab3ac83a3e7a6acf4bfe6ede25/dulokotoge.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2887d4858---96357043209.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608735384c08c---luvufedarewufowino.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/11695278896.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/69406096522.pdf
    • http://pumarecovery.com/userfiles/files/8451931782.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b86ed4792beb19df13c890e0aa88ae3e/51777061403.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_off0000dbbb.bin
a516a3c19bf738ce4f30e3b84845eba0b07e1ba1d28d20d9ae8b6f30a049b0cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 17688 bytes
font_01_sfnt_off000109e5.bin
3d6b335e31eaa7e4b634997237ce0607b785c4c0277c31d1f15c28468d7dae92
pdf-font-stream PDF embedded font (sfnt) at offset 0x109E5 10808 bytes
font_02_sfnt_off00012297.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 16792 bytes