Malicious PDF — malware analysis report

Static analysis result for SHA-256 870795cacba50adc…

MALICIOUS

PDF

102.9 KB Created: 2021-09-01 03:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2cef3b7495e1ac0cd59dc78967dccd51 SHA-1: 627d8eed1e2610c1b93433a2031965cc061f3e77 SHA-256: 870795cacba50adc789fe9d48e72a828f891c514603779bcb0a1b86a773f2841
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, a common technique for distributing malicious content or phishing. Several heuristics indicate the PDF is designed to host external links, some pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://shoppingplanet.ro/ckfinder/userfiles/files/23916252002.pdf In PDF document text
    • http://unionnutritech.com/upload/files/29830811272.pdfIn PDF document text
    • http://slsnn.ru/content/files/26245187825.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/k8oov37b5mvfdth14aead3jop5/65500687019.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075fdec6464a---2233694230.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/vawidimawuregufog.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6ac6d869dc96d9dee1c302b31e0167ee/notulerimum.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/sowixefokokisevunorobon.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/turowiwepezepopulodim.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bbf53af3bd1d1051fac5477fb2553f66/pagakaruremiruwozegame.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/faxuvineronar.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/96527733217.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6lsh82tso44jl8g0epaf20qcn3/gaxaxovi.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/32098381012.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/54190772634.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/04692643b7e2a06e2f87b6316198f992/95702681570.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/wuxesiziferugusor.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/45673477623.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/wuneli.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/61116178407.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/27804432203.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7d262018c---37366531439.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/gozugofewoloxigipowas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=business+math+salaries+and+wages+pdfPDF 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_off00012aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAD 11064 bytes
SHA-256: 1f52ff621d5518d9d0df8232f7b9e1aa56015d64f11d5e92dff6d146dc58fbcc
font_01_sfnt_off00014414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14414 18812 bytes
SHA-256: ecab7026a3e1594399a0e93f6fad01a6a6b06b613118ef71237e1fcb3df5fc9b
font_02_sfnt_off00017558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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