Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a63927b11e10089…

MALICIOUS

PDF

92.1 KB Created: 2021-09-17 10:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8b02636ad5f5926b8ebc4095c25d32cd SHA-1: 885d9a03f7434cdf035866f55191397673c6f500 SHA-256: 1a63927b11e100890b9e2ab0617b387336c6f6764bff21b985d6a4c9b6c75ee6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613d941b3bdd7---48699246555.pdf In PDF document text
    • https://cafepiolho.com/uploads/assets/tazuzeruvudozoruwidiv.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210907_7244B072C7991DE8.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/60674306668.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/93035178199.pdfIn PDF document text
    • http://allier-genealogie.org/File:/bipejemajisepas.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/36985944943.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/80955509881.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/10347493118.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/jexixixawevelow.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/81767396978.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/zipadewega.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///81251785836.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/39458535586.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/79c76c56e13e237e9627a3b66a2887cc/salavurax.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/6d4a68aa6c6d6d6ec4b231a1416c8abd/80453597071.pdfIn PDF document text
    • http://szjg.hu/images/file/wesuxawijerat.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/xelikasif.pdfIn PDF document text
    • http://wwstationery.com/files/file/29370714904.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/35616035472.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/jewim.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/4475336420.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/88049975427.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/55406062488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+spoof+in+pokemon+go+androidPDF 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_off0000ffeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEB 18376 bytes
SHA-256: 1a4bca680c3b479a285aaecfdfaa405b3add0784038e474a7fcfdcc87c328c99
font_01_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 10964 bytes
SHA-256: 276903fd8db72953a3b057f67fc6e753c852c4ad6af764597f36587d24067191
font_02_sfnt_off00014941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14941 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.