Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdc527a7bdfb364…

MALICIOUS

PDF

89.7 KB Created: 2021-07-24 01:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7bb77bec15346cc0c9bb3363ab32154c SHA-1: 0d1713e29ecd313bede63631c136356ebc23e8dc SHA-256: 1cdc527a7bdfb36480d7b83a3a29709392c29b199d3d1d69ffe3960727e568c5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07aa3241c9---gisisurubuseso.pdf In PDF document text
    • http://01host.ru/userfiles/files/14924370126.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xonovajizinujowazezi.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/50775764601.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a57f2d2e---ripoxer.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/perojodamedijojezol.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/r81os10bthm0l8edg886v2j2fk/89012306968.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/4b0899d873607aca96fd671d7550e416/zoreted.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5804ccb03589025d3acffc3c80227d56/mukezewokotuk.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pj6japr8lq8vi7m8vpni8hacv0/sovonuriwuzudexajiwira.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/69773330526.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mogetijifenijinimimumi.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/222229206f8394e0e1a2694e8673db00/votalagegosupi.pdfIn PDF document text
    • https://immobilgold.com/file/4453611355.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be324665e9---87464415072.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/76d8ec4693992e2041d969afe69d36a4/renototor.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/tigufedem.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/nimemutetomawotaka.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/sozabeneruk.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/4msq19m449pnspghjckjbi5opt/radurewufavumolus.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/vozopibukemo.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe5c94f731---60642302701.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/42244781965.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/jetakonilonaninib.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/aaafaa7e82327f7fd7e273b7e912c514/8991729609.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41c1db448---13353362888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+is+facebook+numeric+idPDF 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_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11222 17224 bytes
SHA-256: c08215964d9f2a9fae8cd0df4fb67d0d9fdd63d73c98f4184be1333e45b6258e
font_02_sfnt_off00013edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDD 11020 bytes
SHA-256: 8777699eeae6d99edefb94e791d7a35c9e0874b2f41641e6797304cbb4dc2a52

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