Malicious PDF — malware analysis report

Static analysis result for SHA-256 26c67083a7850ce3…

MALICIOUS

PDF

193.8 KB Created: 2021-09-17 14:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 219b213ca6f40c8863aebe2570c2f773 SHA-1: 393e8d89a2810b4b46a1cfcaf9b5a0567ea60bdd SHA-256: 26c67083a7850ce344ae041532ebd7bdd11875829ec7367f7ea123274827d2a7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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://huntic.ru/uplcv?utm_term=android+4+g%C3%BCncelleme PDF link annotation
    • http://custom-mugs-factory.com/uploadfile/files/4889849767.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kijenebekapebosifojabolax.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/fapirodub.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/puwurupevexisovegitegoz.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/jofuluvari.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/62351850558.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/78203815181.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109080458188230.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/21555740797.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/8879146356134bdb0c6c38.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161367468de243---8582268577.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/sasexinanigumizu.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/55108523451.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/fegodubodedu.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/21139986586.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b054c77b6a5dece65e1fa7e621557903/71765703995.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/remesasapumufuwivejuro.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/60399854767.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/3955502689.pdfIn PDF document text
    • http://ty-int.com/files/files/74083506164.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zijidobobageli.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/zawixam.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/suzekabigerorikowi.pdfIn PDF document text
    • https://sergiomauri.com/images/file/89474038861.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad7501490---nubatakujajesumeg.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/butuwe.pdfIn PDF document text
    • 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_off0002940d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2940D 19132 bytes
SHA-256: a1b13f57766b023de3321402fe75498442749c73ebe6007aafadde0484e82c92
font_01_sfnt_off0002c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DEDA 10536 bytes
SHA-256: e2563e41b925bf89a31a4eae28a9d996ff01860e2cc4ec281c4924c91fd8f859