Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b632b695b51cdd…

MALICIOUS

PDF

74.7 KB Created: 2021-09-05 00:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2bf838456cc9e2bba3480fc97af1927f SHA-1: b45f7b2214d605872f47703c7f2354e8ed87644a SHA-256: 12b632b695b51cdd1f485d5763d8cfaef447a24a6ed0cd2328dda8ac8b053aa7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress upload directories. The primary attack pattern involves luring users to potentially malicious sites through a collection of links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pmms-online.com/assets/file/88839243185.pdf In PDF document text
    • http://vervesimuhub.com/userfiles/file/1686423782.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/pivir.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u3u92ej86lc350f58ilmepj093/xipamilugeroxokotax.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c1ceec88f---97328859851.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/labixakataxi.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vizef.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/j8gpf8skp3pmngfjadpsr45qfa/zoxokuxen.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/45325424245.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/wazeji.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc7a153d56---safibowexafapijivepasop.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/mafavuxofubivogetur.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/temefejatape.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/89560d5da75d0d2c0fc34dd9eef66855/7940080023.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/ravevawutabodo.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/75508359227.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611c7c4459c61---4925386491.pdfIn PDF document text
    • https://ive-cal.it/file/1635677118.pdfIn PDF document text
    • http://laduses.nl/image/file/zalutofukunapo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f877173bc---760145034.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/16449066902.pdfIn PDF document text
    • http://charontrade.hu/data/file/81365079485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=adverb+of+manner+place+and+time+worksheetPDF 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_off0000c036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 11252 bytes
SHA-256: 15818f9ef56ecb64d8ea01ce2fac36834450749717f5ad4a990c2fcaca568515
font_01_sfnt_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 16668 bytes
SHA-256: 219d540c57ba043bc300cbe520d421d780962752edba7bcd9eb5cad1a28e5370

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