Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce64fe7e58e4d71…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 00:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5a5fe37c7327fe67169e3df4ceb981db SHA-1: 4b4e5f0c76da6c7e0d4ee5754e26f738b889f90d SHA-256: dce64fe7e58e4d719420cee64a500b06130be42b32f8b60916edd31125a45c6f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links indicate it is designed to redirect users to malicious content, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=canterbury+tales+geoffrey+chaucer+pdf PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e270e69d09df1efe8569860a9d83b45b/zesobifevo.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3803051c6---2391448600.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/rigokozi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7dii5qnmajhr4u95j3mn6g30ba/18228886817.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/h06p2pq5flvhudbqqqijru8hj4/27234527197.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/65220180367.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2492f6d4eb9345190784813f94b8ef53/zibetukemorof.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/vurova.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/vozebaraporek.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/55989905157.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125390bb1d0e---xubibilowotumorupibur.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5440f14fb---47798370568.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/werunerusuzejorusi.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/10764625235.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/64738775583.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/bafujibajozexitadijotero.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/lanosoditawa.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/zogefuritewefisapomukuki.pdfIn PDF document text
    • https://biocoils.com/img/file/xinikezuvurineg.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/muvuvf65g4re1cu3bd7jmb47c5/8799317337.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 11192 bytes
SHA-256: 9249f547d604eb876c5f2febe308f9c7423bdefedc583938f15f35678205db98
font_02_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 17272 bytes
SHA-256: 0b26e2b1dc1e2e63b823e913c9067d7a6e0ee737069fc8e0d1108f24df40a3f8
font_03_sfnt_off00011186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11186 17156 bytes
SHA-256: d339d2ab70a858c18a17cd20ad97bcb9cbc92d837b99877c141cbc76833795ba

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