Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ebd9d755448bd0…

MALICIOUS

PDF

85.7 KB Created: 2021-08-06 18:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 259a94b3e465f72b7d9a21d948ed39e4 SHA-1: ecdcf8342142f13bc3e7bab4f31ebb036cfe8f81 SHA-256: 78ebd9d755448bd0d8a8097388137162aa7d49a1fe9df29aae58c0f54cec5f31
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content or for SEO manipulation. The presence of embedded PDFs within the document further supports a malicious intent, likely to deliver further stages or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/ledasasogekavujije.pdf In PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/29b8ec9ea5026b5dcde6093a91275d27/15081007572.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a8decae31ff---repaxirip.pdfIn PDF document text
    • http://praguetransfer.com/files/file/13736746731.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/9c456609e39ebcf321ef5fc4aa1187bf/36446627155.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/98937049148.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/32276922892.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/vaperat.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090607a13a3f---ripoxi.pdfIn PDF document text
    • http://93564497.com/userfiles/45229011230.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/97112448703.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/12025383610.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021080422235673499.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/274a0d199bd58423f07d2cb78266b5fc/21577961378.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/sefezitimiwujudate.pdfIn PDF document text
    • https://pabrikangka.com/contents//files/60751940090.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/20420972280.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210624_386DB8995DAB3BB1.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aea78ce0f10---74191289205.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/bisuwa.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608189d40832a---kewawimigonupunosud.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/fepefisidexezi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dq0ic8h30ap427jfrkns2ut9a4/rasulororumakusuzemake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+questions+to+ask+a+project+manager+interviewPDF 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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 11388 bytes
SHA-256: ce97764fbe99bab164c11152759f2580fa96d7a1071d3f32edb3c651cb088138
font_01_sfnt_off000106bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BB 16476 bytes
SHA-256: cd27f14fb0066d28efb741123c3d38762e93267ba70906597695d49db5d39e19
font_02_sfnt_off00013118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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