Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f88286dc0cacf2c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 05:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a755f4174d07c466cc9a7d78429724b4 SHA-1: ad1d36958f7a6411a266e77c5bca8548c4baa9de SHA-256: 1f88286dc0cacf2c96ff8968e457b739bb76f30ba116bdb3846f8feea8e793d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the distribution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161350fa709083---rarixewa.pdf In PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/fuzafojuxoraribapusu.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/29055170955.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/161402ffc0beab---366508552.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/81374011702.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5e96a855c2589ce3fca5aab338cfd393/lowerapufiredama.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/45755792011.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/butobuperilowaviwibijite.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/21668159500.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/86083755111.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/jetozovusoxobofel.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100625504668.pdfIn PDF document text
    • https://22importexport.com/eimages/file/xuluredajodete.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/wabaxafokafeluk.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/xuzuxiwuporov.pdfIn PDF document text
    • https://aitalk.vn/upload/files/juwew.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614103d91598e---30417207053.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/66448138870.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/13519061834.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/fexalefiwib.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e9e3c97718a2c4b2147f277a33b8c077/94930160116.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210901202632.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tomopawukasexes.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/motumegevomarugexuruvo.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/76279664265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+is+assembled+depthPDF 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_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 10468 bytes
SHA-256: d6021ada7385edcdb91da49e3b09f55a3d757482259da5afec8987284eeff09a
font_01_sfnt_off00010c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8B 17608 bytes
SHA-256: 8b7adbfbcadb604161cee4725303c36c12f4d8b00d89d5454b998366b8fe4efa
font_02_sfnt_off00013942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.