Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac768cf39d242816…

MALICIOUS

PDF

106.3 KB Created: 2021-06-26 08:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 110fd64ff6e08c1102f8b26d82853aa0 SHA-1: 729c38d832e5a5c89235c5fff8dbf9d9e2250471 SHA-256: ac768cf39d2428161ee4bed3ffb738d4da47b962b2c1cfc5175088e346dcdee4
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS upload directories, suggesting it is designed to redirect users to malicious content. The file's structure indicates it functions as a link farm, likely intended to facilitate phishing attacks or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9863

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=four+to+two
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/45v7irv7vn88pk8n39ggck6scr/kurikukipoketijuda.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce0fc7f76---58894318404.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608098c37f809---37548931557.pdf
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/nfthiv3gkso2qggd9l76g7cq7l/68140929268.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e866cabfe---tazebibolezir.pdf
    • http://ciaooo.ru/uploades/userfiles/file/10748233341.pdf
    • http://vimbark.sk/editor_uploads/files/8095772686.pdf
    • https://nepalimodelagency.com/userfiles/file/7713222088.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b6fc3e01082690513eed8096f2bb5e6b/86520019286.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba80530a5fa---96016808085.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/cec029ab5fe015e7e62c228f5fa2ef93/mimuzebi.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d079d162bd---13155550683.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca273932ad---vegigakobamegid.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607626bacbb58---zipapisab.pdf
    • http://dwhs79.com/clients/15834/File/31987617045.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a131c1e8a226d3e3e1510594010884ed/ferixo.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d06295778d20609f25531adc557c2439/woluzinejepose.pdf
    • http://xboxheerlen.nl/userfiles/file/luniragevomedakuladegemip.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c85741c82abff0852a37dc160005f67/vuwadenevefudili.pdf
    • https://widepolymers.com/userfiles/file/67748701159.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/903c441689f1628c2a39e95797128eb5/92816198151.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8f459559---8957461226.pdf
    • http://normel.org/files/upload/file/zoruxibunesulukixenof.pdf
    • https://lapdonline.org/file/62761866905.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d59.bin
b598de349134fb2d532a8d01fda579a6de3140622526921ede799f55ce2f05ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D59 9560 bytes
font_01_sfnt_off00013214.bin
61ec03ae04e46196fed749454a545fd4d41a3c2a8a4d7369b04cdd6196da5ba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13214 8176 bytes
font_02_sfnt_off00014dc9.bin
1ac5b2605d0482e912e8962e46b62c2e2818da3c8271c1228703ca40d23e7a49		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC9 20140 bytes
font_03_sfnt_off00018223.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18223 16792 bytes

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