Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53de34905d74f7a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 12:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5533251f62c8b12743b60eecec91605 SHA-1: ff8a601a18095fceb5e84221668a01c95b9b1ba0 SHA-256: b53de34905d74f7af98762e8c92dfc42e89a6baf6fe218b8b76b2d619a65afb6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and link to potentially malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dddf9b2e4---27654341486.pdf In PDF document text
    • http://nrgmedia.hu/files/file/xawirikolulakitipexiwu.pdfIn PDF document text
    • http://potlista.com/file/files/37122135345.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/88077302683.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff1ee459c---90075856568.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/galibif.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/bimaw.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613192047e390---fozupovazerixur.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/74306766906.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613339c8268a7---muwafigatitotatir.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/27833214959.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/51323242428.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/wexamuwenixelawoxujadakop.pdfIn PDF document text
    • https://parlagame.net/calisma2/files/uploads/69038177845.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/jirezafarijejifuxonuwopu.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/gafixegevoxojemilatib.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/vukudeboroladekanowo.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/7797413358.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef7c2f2b35---38723187014.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/joraluvigobizibodijepafej.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614451dc83e88---71079378790.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/padogowirudido.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/xipoj.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/foxepuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=neet+2019+answer+key+allenPDF 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_off0000c282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 17028 bytes
SHA-256: dd60085539cb969765e155e67ab4b0aaa6b8381805acecbb70e79f6fe226b8d3
font_02_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 10620 bytes
SHA-256: f263d4fe32cf3e8d6fdaab051daf398b8fd7ec0c62fdd70cabe47d3605e82d99

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