Malicious PDF — malware analysis report

Static analysis result for SHA-256 2505e760979e35ad…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 01:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f160508e21111544f0ee33489b535a80 SHA-1: 3a5c688707207226b2eb90aa65337d3bc582c9da SHA-256: 2505e760979e35ad8c706fa2c13cb3b24eafd0190b2556befe67814139fadc2b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://parvazyab.net/basefile/api203/files/28060695859.pdf In PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/vuwirifedidanif.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/fuvozexofamunalu.pdfIn PDF document text
    • https://almavilag.hu/files/files/nasuwavowafu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142077d84514---51996637935.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/30675180021.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/jogewizogaxizexegedapu.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cfeed261f---juvovorewajalaterada.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/xekebudasesofolixemajowi.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vojibodefifewan.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/furomekeka.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/vudafakadokupudib.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/takatolebag.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/cbd7e5af00b459220a413af8d2722ac1/govogajozanako.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/gubuwekiminefizedi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161309a7b5b645---fosobojefumuzerad.pdfIn PDF document text
    • http://vln.nl/files/file/luzasumogip.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/juxuva.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/lawabux.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/70689151439.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/7011529121.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/75743662703.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/32603410060.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/78110060802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apps+to+stream+phone+to+tvPDF 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_off0000ddcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCB 10428 bytes
SHA-256: 994ddabef35681eb42b5999da4cd79564b27f78ccda181b3b5eec3fdf94d323c
font_01_sfnt_off0000f54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 16912 bytes
SHA-256: 8803cdd0d081b5540e351d54b39016c0c0861e21c553cd3d32afccf4ef578ad1
font_02_sfnt_off00012148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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