Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d6ff7b40a2a281…

MALICIOUS

PDF

93.8 KB Created: 2021-07-27 11:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8456338babcb5daacf68eb75b37900c4 SHA-1: bc5efbd803d301d7add9c393d82210398d624ac6 SHA-256: 98d6ff7b40a2a28187753af7493bbcb79a4d2050c7ed4add5d6867b2d109f08f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a347e08c---dinisejifupokumasoxo.pdf In PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/076ieiv9fbkcpruinkfe7jdfbd/27523409020.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/96810361207.pdfIn PDF document text
    • https://brs.jo/userfiles/files/94862468811.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/diditovireputazefavupujef.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/11533151253.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a6149fb0141---ligiden.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0k9o57g0vcf9us3eh812tpfpvb/rowosuxapifotikuzewago.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/d91ee510702e1395f4e355680aae3961/xubid.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/a64f935af0737c5dd2563cfcd7cf7900/7672239576.pdfIn PDF document text
    • https://kristinanamaste.eu/files/87003593297.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/muvusemomadapowelu.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/083f52ef3f52731d773c165a5f15f739/93793881810.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9ad3eb436201ca90460880d194ef3dd8/bijevilinabonerutezexerut.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/xegarazidizudekopeme.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/4183666546.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609de67c2c27a---62803965002.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/jeranad.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d75676520d---nosixetexagaguw.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/fikuxa.pdfIn PDF document text
    • http://montrealinkwell.com/clients/c/c4/c478fb9048b4d856ed1aa16e2301f982/File/66141469740.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f983258c3a---26673077813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+searle%27s+goniometerPDF 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_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 10584 bytes
SHA-256: 2b47de83a102643c7edeaa853b5f00a70be43d4adb357e41c41e89dec728120b
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 19872 bytes
SHA-256: 319133b0177c5d22f4210fbf6d36b3a69010f6252185047530dca208137185d9
font_02_sfnt_off000150de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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