Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd868a021f032d8c…

MALICIOUS

PDF

93.5 KB Created: 2021-09-16 03:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b417bb4c06811abcc0e10f5c145122d3 SHA-1: 4a96a17edea1b4a43ffbac7bd895d14b908c6137 SHA-256: bd868a021f032d8cf9b431117148f764ba055dff380eea2fcf76eb73177d7c9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://successstudio.net/userfiles/file/pipiwerulaleledig.pdf In PDF document text
    • http://elfuklid.cz/foto/Image/file/paseluvodon.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/fifatulapasemotirofu.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/97067446468.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141add73923d---88079815230.pdfIn PDF document text
    • http://ruihuitax.com/files/file/levowis.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16140f33a1d63c---53061929744.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/waxosowusiniwofenupudeviw.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/28663819140.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210904/2109041531095462350iyh16w3fl8s.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141d638b5974---75144903801.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d02cbdbe12---857639558.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/42663103573.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xotiwakevolivebof.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef33e34d7e---nobebofoxaxavamin.pdfIn PDF document text
    • https://angkagenap.com/contents/files/94734313399.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210906171501.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090220294125.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/6949634557.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/79828625220.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/xerukilugopen.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/99652205155.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/pexape.pdfIn PDF document text
    • http://uhorder.com/upload/files/46025380989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=fortnite+code+for+save+the+worldPDF 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_off00010af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF5 17208 bytes
SHA-256: 3dd6d43734453f8dab15d88916e65793ebe0a061d08cfc77e2a82158509d4520
font_01_sfnt_off000137a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A9 10704 bytes
SHA-256: 27a31158616a6b3aecdd52f1ddae81151b3361f269ec9ae80716967d9ce3d536
font_02_sfnt_off00015032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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