Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe27eaa5dab44ce…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 11:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 69ca0a80887521b0d7dfe358cfa32738 SHA-1: 181c890052b2fcbd005b2acd66fdcd2a26a19840 SHA-256: cbe27eaa5dab44cef359310b0f384e2ba7cb2a7246242788effc0c120932bfaf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URIs and is structured as a link farm, with many links pointing to compromised WordPress upload directories and disposable hosting. The primary attack pattern involves directing users to potentially malicious external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=jumanji+2+telugu+movie+full+movie PDF link annotation
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/ja979jk1jj3uu4d4trtrf1pprl/13996727385.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9a43d60e---76503214044.pdfIn PDF document text
    • http://friulanapanini.com/images/file/7182933634.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/fonomi.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/96c806e0fb0ea58fac1072feface3034/lamewovelobazuxegu.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/xanelatujade.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/nigobakajawerikexif.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/boludefavoxegagop.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/vozojesipixudifizak.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/52327074510.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/godedo.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/puxetizijan.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210918_101935.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/25061244618.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/guxokileritot.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/94318692989.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/98654332143.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/2974154499.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/wivenavabel.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/kadigug.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/61502010017.pdfIn PDF document text
    • https://tigaintan.com/contents/files/xowowugavepumigigijajoxev.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/9131961743.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/71493364828.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_off0000c0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FD 18008 bytes
SHA-256: 1a9c87836dc8b8d45a0e7f211f209e234cf0804dbc5fd9b361b099f99edabe59
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 10696 bytes
SHA-256: 1730120752428269e3f0e6683a809e15fc9c596177d98f2b80b7e423b9e2dd58
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1