Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc1a95c414ad2b42…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 21:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6798443c1d252d5a25ff5ade67f69ce8 SHA-1: 85e879e79e710ee9619a151d2ca6fff4b9529856 SHA-256: dc1a95c414ad2b425ad1d9c68d55932b743bc69a3d6626f765d09d565932cf78
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to other PDF files hosted on compromised websites. This suggests a multi-stage attack where the initial PDF acts as a lure or dropper, redirecting the user to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://giritrademark.com/content_files/files/76280149843.pdf In PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/xakojedukagesojagelajaz.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/17273376832.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/76297079792.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/174b14acfb8b868d19591e82f82e477f/figiwibinokalukuzokisow.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/pamaxezorafatofijeluvere.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/lamuzukatux.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/39658549360.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/81732725156.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/rerolebal.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/fijizadigifega.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/nixafuguwolawo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161344cf850f56---1518308964.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/86163411927.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dubuwudiva.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/nefig.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/jq1p01cbrd2584cptl704ri86k/jimosekarotum.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/80113276756.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c60f6e4b85---jasedusutabi.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/96785243319.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/61499180712.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e79964fc43d296618a139fe96a21e5ad/85831500943.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/jukukin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=index+of+warrior+tv+seriesPDF 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_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 17920 bytes
SHA-256: 2060fa42d87fc19dcf7080ee0f9ccd4841a471c4399929d5815a8a30fd3e31c6
font_01_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 10508 bytes
SHA-256: 88bd3dec28140cff928c22c385b428ee841ffda4e37105679eb4e01cfe133147

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