Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc98286fcc7e629…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 02:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f70ecc83ae1840cd99121a1abf16101d SHA-1: 439369fd437e53db9ef6f0a9a6aa15b3ff2228d3 SHA-256: 3dc98286fcc7e629e7b1b58c845e5ac19cfee172c18075917d4b52ffa7335a88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://greenbrier101.com/userimages/6681995744.pdf In PDF document text
    • http://betonkeritesek.eu/Content/files/puzaxusenuwoxabenane.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/98dfb53fbedd5d984e0169a0c005c3eb/14571958556.pdfIn PDF document text
    • http://svx.su/ffile/file/volulitesirozibudar.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/roxanepojogisufasal.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/17380446282.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/45364156449.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/kebomajufenufajajufipux.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b86de34239d---vududugegefarisakaladibo.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29ce5c54ed---39056383471.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ad32e713---kuzojajobifaweje.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/96810337495.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/96776435384.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/qfrm7t3mkg0jg5h4o23m01km1g/84182661857.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/23374915246.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dc71b15be37d4a376832f15fec60c7fc/1230312570.pdfIn PDF document text
    • https://bataretak.com/img/files/file/lixuwalagomi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c57219339b778699ec5b61248d0df0ce/15121881984.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e56596b81dbcec7efe230bcbbb14a422/54409921618.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/bigezuke.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dfefb577c2bbc97d60ec9542bd37eec5/bumewomexamezejubaledazaj.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/41570884706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=air+laut+adalah+pdfPDF 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_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 16644 bytes
SHA-256: e3edad51d733da9a04586386c5b5a3c8b9e0b03644ac96343f9f8ed8db61b76f
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 10152 bytes
SHA-256: 3c1740b0f4781ea057fc9c9eb2b97532abb24b52e56036ec72534fff87a837d8

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