Malicious PDF — malware analysis report

Static analysis result for SHA-256 2987c19ccb23f2e2…

MALICIOUS

PDF

74.0 KB Created: 2021-09-15 21:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab95e686926bdd0311afa7e620f8651d SHA-1: bc2df6bf132df55663051ec41dc8da70d34ba0be SHA-256: 2987c19ccb23f2e2ac3a31a9f645f12ffb21be5876d5495244ba266f000ce7b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely for downloading further payloads or redirecting users. The link farm structure, with numerous links to various domains, is characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=mpe+tube+apk PDF link annotation
    • http://etkenkalip.com/files/82324996989.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109071301431703.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/jijewuvopobitikeko.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/wojeb.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/89722727447.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/90370774296.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613125da7f1d7---16053332543.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/62445340202.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/kurafegunopivozuvuke.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/79181992688.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/robofitazutum.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/lakediwo.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/pimeluxarojuwiliguberem.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/59865752530.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tipetowowavo.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/38005355232.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/jirivebojizajazovezu.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/xamojaxejogoniv.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/jalafafep.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/70195381060.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/fcaa5b6e2ad4f0a2059211694eaa7b18/19498086416.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/41850737044.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3a598bd584b740ec9243bfc6177b2da5/59205300746.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/zerawuwokinejiparetukako.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/12993392473.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_off0000c279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC279 9940 bytes
SHA-256: a82d71e0bec0dea8397cb02d30852bf45a3d1236039b697d38e54172066b19a1
font_01_sfnt_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 16340 bytes
SHA-256: e078983bd47be35ad488ace8b5316be177106e2b59fa6d173d7590728aaad62f
font_02_sfnt_off00010280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1