Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc1632f90ae23bd…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 14:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c48120b27b7b81e2bb9debb540c1b57f SHA-1: 0d68e85630f8740981a8ed28ebb5c800d5ca63bb SHA-256: 6bc1632f90ae23bd13e03c4ecada5fad4cae24098c571e4ce05c0a72a5f82968
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • 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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16131d4372502b---madebo.pdf In PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/zukikesatukaguxujusumoful.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/46278970096.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/finigelamadofok.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dazesudozegujirat.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/11105895225.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/95841027776.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16138d6ccb810d---jamurotemaza.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/sezozoxuxu.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/nisifowajasudigupan.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/88390922865.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138c87110203---lijipizokofedefisikusi.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/5478161148.pdfIn PDF document text
    • http://rilta.net/userfiles/files/rodewenusumobexo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138d09f70265---jivoladugomo.pdfIn PDF document text
    • http://dolonchem.com/upload/files/vunojajavazonedorumas.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/vedafepi.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/51340452163.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/20172836473.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/botoxukufokupumekunuj.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/wimikaripuwuvip.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/89155372196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=wild+rift+32+bits+apkPDF 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_off0000cb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB30 10652 bytes
SHA-256: f1e43e28d1d2ba86b749040553c92b3a1f451158331e3ed7ff7138b9b1a8a9db
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 19020 bytes
SHA-256: 5e085fd9f5589f6cf9b35ae9ed6cbcd1fe22d888c3a786da597574dca7e2ea3e
font_02_sfnt_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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