Malicious PDF — malware analysis report

Static analysis result for SHA-256 776687fcc16d0793…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 21:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a81991b3e89b66dc5d0711900916787 SHA-1: 87454248df43150309042ef15487efeeb40b3ccb SHA-256: 776687fcc16d0793bb3f89704e8ab1a43bbd8ed7ee78e62b201509508bb4a309
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan distribution attempt. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of multiple links and the use of UTM parameters suggest an effort to track user engagement and potentially lead them to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://thietbivesinhanhhuy.com/asset/files/83906675724.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d70a82a597cc7c71196d39c79f8fa9c2/bujesazuzun.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160761d0d5fa93---nupofatisedapa.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/xumoxa.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/dipadax.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd14c09e9---68201504121.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/sobp1lohasjvgp31t04l42r42e/46656953829.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd33ba1e23---rolox.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/999042891b2830b92d6169017e85c01d/gonunirosurijafesap.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/j6ktb1lv3ds8e7trntkhi66pfc/wejafuvukezewu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/zekigozesaj.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/731f88308a15ac691d625edc03a6a4bf/77047897751.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/29910296148.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/lb73qibhr68pohlg653iounc61/fozoje.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4a2499025---38661847919.pdfIn PDF document text
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/9361407143.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/db4258bd57321107b91414f101bd04a8/85816612859.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609366b3ee26e---500501117.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079e00ba61b6---57932336949.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087c7fa4b325---pevusavamaworuvulurapuz.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/leliv.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/99645260257.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/60012066083.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b0f6e003a2db71cbd09809110c2419e4/99185444879.pdfIn PDF document text
    • http://dzbnf.com/upload/file///zewababekejale.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=confluence+insert+check+markPDF 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_off0001041b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041B 18280 bytes
SHA-256: 7e4d92e936e421a76164841ec841db5b5991e46b3de21b656c017cdf12ec313e
font_01_sfnt_off000134ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D16 10824 bytes
SHA-256: e84d1aacfb967ac0e62471d6adaf6ac1459b4389f7bb4b2ccd9fa93f503fae44

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