Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b00654d0662320…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 14:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44c374b44a6535502e082432c38cc4ba SHA-1: d87a97ef299dbe0757c8085213950555b3b06fe2 SHA-256: 27b00654d066232069460758100db706469b6833545e3ab5b50db583e049c493
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on disposable domains or compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a link farm indicate a tactic to obscure malicious intent and potentially distribute further payloads. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://limobebe.com/userfiles/files/97408060626.pdf In PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210907_E3D92084276AC481.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/dojawobakinifez.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/xufamilidal.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/remeforupuvativipuda.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/ganewenovavo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161385c8ed4ac2---51868511699.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/kovevuwabeke.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/87478383965.pdfIn PDF document text
    • https://ever-progress.com/upload/files/zesuguge.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/jotalanovedofasagawi.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/82334350562.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/36825704889.pdfIn PDF document text
    • https://asken.as/bilder/file/41153920436.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210901_192E54FBF69F5AAF.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/78186556376.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/susete.pdfIn PDF document text
    • https://petikdaun.com/contents/files/zixasasemijumuxubav.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/27c83c32e1efd58b5aaa7bcf15e9c25d/61040003094.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolulasazuniwavij.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63ddc1d5e---70193712087.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/062323443764.pdfIn PDF document text
    • http://boldogelet.hu/media/17198119426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+gta+4+fan+madePDF 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_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 18116 bytes
SHA-256: f26e3c0e06dade31451ffc246bf28f361a4f9e9c13f1f6ebcc4782484e744711
font_01_sfnt_off00010efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 10500 bytes
SHA-256: 19947459ff6c382d350692f267cde67494d20941d401b6482939e19ef40aa0bd

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