Malicious PDF — malware analysis report

Static analysis result for SHA-256 440b31fbd58e889b…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 05:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e620678200f0260efb3d56ecce5abf48 SHA-1: 5487a477d6d8cf4f29392fbf58a7909894b31e2d SHA-256: 440b31fbd58e889b9f0b3aa6a907e250c94b0ac3a900b91422131f19940cb0f7
184 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing an image-only design with clickable links to external sites. The presence of embedded JavaScript and numerous links to potentially compromised or disposable hosting services strongly suggests an attempt to redirect users to malicious content. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://musicandyouapp.com/webupload/editorimg/files/41265640191.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/i2kqtk96tm9nknqudq264selga/31151423169.pdf
    • https://escritacontabilidade.net/fotos/news/file/gamuroxolorizimul.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130601daf00f---malulofabetidejok.pdf
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/41877133608.pdf
    • http://thy-environment.com/userfiles/files/95721406449.pdf
    • http://shqinze.net/admin/upimg/file///40129913591.pdf
    • https://blv.by/upload/editor/files/gomotubepiluxugogegesik.pdf
    • http://mnarch.it/userfiles/files/woreju.pdf
    • http://tongshengchem.com/ckfinder/userfiles/files/67251295396.pdf
    • http://abbeytraining.net/userfiles/file/30912316061.pdf
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/21987275968.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/ae894bc769260a81a2a60b9628af8c5d/26178699568.pdf
    • http://homestationrealty.com/userfiles/files/26718392640.pdf
    • http://daglichtfilters.nl/ckfinder/userfiles/files/mosoberurimipagevolan.pdf
    • http://myshiou.com/uploads/files/202109221605263941.pdf
    • http://chargooshads.com/images/upload/files/84440837656.pdf
    • http://swotaweb.com/img/upload/file/sazibugonu.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc51796f5---xejadigenud.pdf
    • http://sportschoolindex.nl/images/uploads/9763175286.pdf
    • http://muasamhangmy.com/ckfinder/userfiles/files/77213845661.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=god+of+war+3+iso+download+for+ppsspp
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af26.bin
88c27a8a4b9373705773747259f9ee7f9db3a97541592740186576f0f8205564
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF26 14516 bytes
font_01_sfnt_off0000d3c4.bin
dcae6b6f3992d4de51df49cdd9aa27c9a0d3333aeaee0f36c49e91224d597fa0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C4 10556 bytes
font_02_sfnt_off0000ec04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC04 16792 bytes