Malicious PDF — malware analysis report

Static analysis result for SHA-256 334c0ed21cf4fa38…

MALICIOUS

PDF

82.5 KB Created: 2021-09-16 10:15:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 966fabb6328b5c00810a4a5d72486f35 SHA-1: 89123904b07294018b422762b2db04fb77320a64 SHA-256: 334c0ed21cf4fa3864e6c4e31edfd2c0d8f19ca196e3763c88febe113df1ee96
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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=emotional+guidance+scale+pdf PDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415ca1f1e65---24724778363.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/dozin.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/jubalofuzolepodilubukem.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/89428327578.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/pakuwitotugupijukikuxa.pdfIn PDF document text
    • http://www.bandungmesin.com/file/zapevelo.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/ralopa.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/figol.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/7459759608.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5cab86b6f0b36b21dbf35b6ed1a08542/zikagisatujid.pdfIn PDF document text
    • https://tpk-m.ru/files/file/39138576921.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/diwox.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/42881258747.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/20576116525.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210906161709.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/nixob.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336491009cb---26080003745.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/v136jn1l9sc22iejlu9mo2pif9kmi9eq/24226112155.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130080eb8b4f---zelasipur.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/50723756923.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/weziperad.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e6cfa9aa2---woviwadakuluvejunasaxok.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/kamepifugag.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/mowimofidutanebeva.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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 17696 bytes
SHA-256: a94630eb9c7b05d2f2197388a728a88706fd6151aea1176f7290c1d5d62b14d3
font_01_sfnt_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10948 bytes
SHA-256: a01d75c42d94e1a79560ca8040068f6ca66453e97db4a2bf090d8b9b5d3b162b

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