Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e187f613c01219…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 01:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9f99bf0816bc78a27e46a3267c3cd44 SHA-1: e56ffcceedb5a86bce9e5bdf95c2e2a7ea6782ff SHA-256: 41e187f613c01219a2744f515d02986611ea2954f9456865913a9b61b7bcedd7
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a link farm that directs users to various PDF files, some hosted on compromised WordPress sites. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content, likely a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://presstone.hu/userfiles/file/nenidiruziwema.pdf In PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/karefirop.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-13/20210613132316234008.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160906f018f35d---26067232642.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/1399326547.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/27111670658.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/gemigo.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/nunamazugatoxuxotojezuj.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/34598606166.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/53367608864.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c9d9434f8c---felasi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928e677e65d---21533092950.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099be7c96d84---nakanozumakitobuwaxo.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/liwotivoxo.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/30633749550.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/tosazewobajixejeruzikedo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/36332523613.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ec1a83058d2293b4c47db56ea1529740/51775180079.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/fj0ovjh3t3ua7cs8ovtsjuuegp/juposajalofoj.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607df52d658bb---37693159304.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/15014166181.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/8c6351279a0501b3259851c8862a7916/nenamujifev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mba+stress+management+project+pdf+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_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 11220 bytes
SHA-256: 409203bad8987c2823ad44ea7e342f836124a40cd1b79ffce3cb4c1a8ee65063
font_02_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 16948 bytes
SHA-256: 6805f4d2ff8edc0438bc716e4fb2ebeb0addd093bed3989ea79c2ac10af91e14

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