Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e06f12b68b6fd5…

MALICIOUS

PDF

92.5 KB Created: 2021-08-09 07:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0b659b54c08f44188df986f32851e277 SHA-1: dcefff5ad75ff0df44bc6db81bee466fcef68e97 SHA-256: 87e06f12b68b6fd50beaeadb1be5b4d65769c2db9055d988aad1b596688dab53
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a browser extension installation lure. The document body is heavily obfuscated and appears to be malformed, but the presence of multiple links to potentially compromised WordPress sites and the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggest a phishing or malware distribution attempt. No scripts were extracted, but the overall pattern points to a social engineering attack designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/c6d3ee25c6f34dabb692715592ed0292/72840286148.pdf In PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/4f38bfc813ce60cd40b5858514227689/vubavoke.pdfIn PDF document text
    • http://hongdacable.com/d/files/38161943206.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/01a23cd2d1a1343c6494eabaa94f2b44/xujivuwin.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/niroxanamisofikopuvu.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8aebbcf2---nemarodun.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/58574192643.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/guxawawojegaj.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/vagiwaferuf.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae29619a01---6548174544.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/81b96d3b7257683879e0f144ff489ab0/23680826950.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/67569392678.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/xopib.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/50816597466.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ce0ofi1e8uqu1i8jvu4e0a4bh5/lofedabojunivor.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f75c27f11a---manobobazonukoxeb.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/88651306969.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/ff0ac45a53604d9a529aac78796fda65/20117208200.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/12386144886.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fa9c8071---ladig.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/56472426673.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/25682944208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+secret+life+of+bees+downloadPDF 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_off000106cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CC 17196 bytes
SHA-256: e8aac77fb6e7dbd13dd0fd2dd8680c635e0237118d0f155ca96aa9f73011cb0c
font_01_sfnt_off00013346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13346 10764 bytes
SHA-256: e71b9a5e560386029a31cfdac3d399fba064069b58b25cdc6dbb066da032f632
font_02_sfnt_off00014c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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