Malicious PDF — malware analysis report

Static analysis result for SHA-256 42fbd731f64bd592…

MALICIOUS

PDF

167.4 KB Created: 2021-09-06 05:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ccb23bc1e9e8802f921457db617ab95 SHA-1: 5250658a0bea0a3c43cb587c0c43490965007031 SHA-256: 42fbd731f64bd5920e5458391d0148452c4eb93bee6d9a3f83a2937c33a0d6be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to external sites, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://coretry.ru/uplcv?utm_term=badger+flow+meter+m2000+manual PDF link annotation
    • http://feuerwehr-mittenwalde.de/mediathek/files/7373828141.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/54551785533.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/koxosogulafoxuz.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/tuvilizodusunuvivopamobu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad8387f7a---laratopajo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c680b85727f---62263423406.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109021830306007.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/lolezasepopujugitopemi.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16120060e2a19c---86398979428.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5183e6470---12866906897.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/51436578637.pdfIn PDF document text
    • https://geniodelweb.com/file/98522514804.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/suxifiwiniwuwula.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/metamekanazewe.pdfIn PDF document text
    • https://koratspring.com/upload/file/bufagiwugusubewudunu.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162645450850691826941.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/mekubogonixu.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/wifiwe.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/bisutagumuji.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/85d1b3b709852f2c9e4ad36b332c5853/mizalusedoberi.pdfIn PDF document text
    • http://huiking.cn/uploads/file/260237064109.pdfIn PDF document text
    • 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_off0002345a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2345A 16304 bytes
SHA-256: ad801a9dbee1a95269b75f6b49f93bad1745ac6f94c53301f1a1d4dc0f0cab5f
font_01_sfnt_off00025e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E81 10920 bytes
SHA-256: d9371320b5cb9750d003247ff426c3f7b2c48abbb4572502b17b65a0327758dc
font_02_sfnt_off000277b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x277B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1