Malicious PDF — malware analysis report

Static analysis result for SHA-256 894147bbf515f908…

MALICIOUS

PDF

81.3 KB Created: 2021-08-18 07:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d650df7a5c43027de24b6bfd1b7df630 SHA-1: 957a7f32a5d9556ae424a6222441a8fc900eb0d0 SHA-256: 894147bbf515f908a9a0d28bb1a854f7bcd0a8f5e8e18cf9072e3626043b4d49
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://soudurelauziere.ca/upload/editor/file/zuguzumovesigib.pdf In PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5e55e078---43878288099.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb20cc3621d---28973410739.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0c8c8d203998a01a4347dbcc30269bec/remalojivulax.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/dosogisazu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/512499f541e3da3d0ca687b1d6732bb1/wigove.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/128a0f8a7ccfe33ced6052495175e053/jufebanapiwuneliminetan.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/27997488147.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/72603291215.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94ea235ef---31289722554.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021815326475761.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/47976796263.pdfIn PDF document text
    • http://simonide.org/userfiles/file/goguwejak.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16078b66803457---12032587322.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d74434d871---dinipewiwisakaz.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99d1d84ef---37030195402.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c05ee2ba79ad786b15fa8f920d017c9a/xevizato.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3c9982742fa76e11f36515ec1c57da3e/bulopezaxitazolivefama.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee048fe4d---37898065407.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/10357292581.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/xotisoliko.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/53326214645.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f42c936ab0b6101c425877aa3e33f02f/sodudixaxuwonaxotisesobum.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/297a13edc0f7f5533c76eebca5cfa59b/12547087130.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/2514971235.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/woledipufumuboju.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/zodewepemejovazutizixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=understanding+business+ethics+stanwick+free+pdfPDF 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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 11160 bytes
SHA-256: 0a360ff7cd2a35529d8adf19251d59b1abd23de3acbe8c7724ca5e43d004b058
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16460 bytes
SHA-256: 0fc8786b9e3209ecd067e8ea142e4e99c76a01c15b6437798e732e557c241596
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1