Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d78dfe97dc9db58…

MALICIOUS

PDF

75.7 KB Created: 2021-09-27 23:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 603119db6c2db030c22df6a8a61b4a40 SHA-1: f7fbfa90e03954a283060f056fa7182c00e4a9b4 SHA-256: 7d78dfe97dc9db582accf46b95d8d419e03573c049777d9c753204fc69e9e6ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://amindoost.ir/images/upload/files/romajuxe.pdf In PDF document text
    • https://noventa.cz/media/files/file/82561379027.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/978d1cccdf3ae28db07d5094f81df163/10472648714.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bbb5886313305faa15ca5f84102f27d2/20094488756.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/medofumomig.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sikuwiwu.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/jutuxosuda.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6842c8fc2---44567275012.pdfIn PDF document text
    • https://securitydm.net/slicice/file/93879874017.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/62539255088.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c240eee64d---mokonamigow.pdfIn PDF document text
    • https://pepsima.biz/files/file/45236613187.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1a6ad1d988c18e40aa98b7612990d295/vujitipapisege.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nb9g0sngg4roasersk274nbfd2/17795675321.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90a469ada---50644589475.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/49184895650.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/98201410227.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/paseko.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399371eabdc---216686761.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/647728447614f2299bba5d.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210909150806.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161519123bd445---mexulujabikipoweguvo.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/kajexinoj.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5ceb0ec82ee2943953d07c11f9d30e82/62751926031.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=firestick+force+close+appPDF 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_off0000bd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 10436 bytes
SHA-256: fa94c46a5d95662eaa3e17bd6d66c1a1635567dba95fb353a824190c2b76a226
font_02_sfnt_off0000ed21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED21 20264 bytes
SHA-256: 89998bd6fcb2937b74dc83b17043ef529abfb1267ec2018a1098f8071aebf8e7