Malicious PDF — malware analysis report

Static analysis result for SHA-256 f09c109fa09a2a0a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 11:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9eb7000aa4a1d6b381c306e9df17ca5b SHA-1: bfa24b5be1f3ed8bc1e2424ed94bf7932f30c145 SHA-256: f09c109fa09a2a0ad7e8b8b1fa3ee5e3039be7048f3dcb2236ef3e4dfcf89bb9
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'password-protected archive handoff' heuristic indicates the document likely provides instructions to decrypt a payload, further supporting a malicious intent to deliver malware disguised as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 https://partnermind.cz/images/files/14767871518.pdf In PDF document text
    • https://andrejc.si/files/file/65561512142.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/kosaxulilutezasubi.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/ralefodemosaw.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/wuwur.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613263e7d9360---gujovirug.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/36969659017.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/diwojotu.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/butukojababelab.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/14154473595.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/21916849197.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/zalifuzexep.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369573b0a61---1547223705.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lodopusonilefokewo.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/bizedov.pdfIn PDF document text
    • http://volamthienha.top/userfiles/file/sogajelenimu.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/44937047107.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/15827905337.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/nonilotowepexuf.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/30d82f2034a27036682b49fea80e4e0e/deporowenifi.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/43866490521.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/72213704089.pdfIn PDF document text
    • https://edusfera.pl/upload/file/42185504503.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/75421927606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+vice+city+apk+cheatsPDF 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_off0000da47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA47 18036 bytes
SHA-256: c7e777c15792f852e938d711b590a5aea9c9faec2a5142647b56c4089c3319df
font_01_sfnt_off00010893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10893 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 10412 bytes
SHA-256: bead14aaf88f733eb11b17126c37c3e3ad89d8609eacd8d28684db8915db780d

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