Malicious PDF — malware analysis report

Static analysis result for SHA-256 01025558acb3eb72…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 00:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee0c6f5acfb89ee7c6b36ef566c22605 SHA-1: 5ba4a362e93d7fb78f3bf5ba48376bff745fad94 SHA-256: 01025558acb3eb72ddec593226d5dda8728a1bc0b365f3d261de987a362b15a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links lead to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=3+player+tetris PDF link annotation
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/wewawoxovudimazatox.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210906075338220429kuvgmg.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/lokejanusitosevefuk.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/92718481526.pdfIn PDF document text
    • http://elsped.hu/files/file/zugarasasulire.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/52504271151.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138482597df5---48778996124.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/zudezezuxeputuxilos.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/12626475566.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/tevaxojosumujebe.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/rejezifozezun.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/98b8h0ft28ue31mfup2m9e9vsc/54226854583.pdfIn PDF document text
    • http://pedraferro.com/files/files/sapanavabinunenut.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/04b9426cb49eee87daf662ddf19e9b55/zuvovozekuzukesi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaac72a1f5---zodezidadafozenuromireri.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/27824997774.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/91674482952.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pijekopigujadadize.pdfIn PDF document text
    • http://stonebreaker.at/zuvimivazuj.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/83270937613.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/nuzuzerase.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/52818944834.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_off0000d2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB12 10212 bytes
SHA-256: 3c09997af981ceb63230b96cdbff5526afcd7c610a1ee520f179bbd60e39ff65
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 19140 bytes
SHA-256: 920086d04d89a94d0743e78540e544a4be6203fabb5e332585021911e6ca6d74

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