Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39ad3b295d90f0f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 02:34:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62effcec1385f735b17f461d9bd23561 SHA-1: 02d6fd51f555f17f078b5e86ba8c5a444eb2d7d5 SHA-256: b39ad3b295d90f0f5f60d41a17c28b6bb5b3d9b5bf5012eb13bf4aff21125675
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The presence of numerous unknown reputation URLs reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://moristas.com/userfiles/files/1157404589.pdf In PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f3056653---sufinoxojoxigun.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/70588901070.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf0fb3189---xerifafunalawuzukekew.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff1cc2fa0f---35134778303.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/83364716158.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607de4064b31b---sazujesu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cc12af120e85077ec6f8ecb206ed2e9b/vopazuvutexazi.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/a16d6cdefdfe194819eea9cc42ee745c/27496695893.pdfIn PDF document text
    • http://davcpundri.com/css/file/wevag.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/54762022254.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wuwadi.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3fff13696---nadawexotexoratejedogab.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/22679588603.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/85508666185.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/bikupapot.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/409480483.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/gibal.pdfIn PDF document text
    • http://kasargod.net/uploads/file/79255848822.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/lexojerixiwivikijazif.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/74383651390.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/dubekimipizi.pdfIn PDF document text
    • http://geose.ru/userfiles/file/95790496953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=kindergarten+sight+words+tracing+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_off0000d4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CD 10932 bytes
SHA-256: 2d1d09630fa6a1a18c5e296180268746b5d7fd5feec638c47648a8d1a31b4749
font_01_sfnt_off0000edec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEC 17236 bytes
SHA-256: fd5c1bd9970e187ce2f37523621e6b1ae33df7ad45b9d6209ed4937bb712e14f
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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