Malicious PDF — malware analysis report

Static analysis result for SHA-256 9740de7e1a79a908…

MALICIOUS

PDF

69.5 KB Created: 2021-09-24 20:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 15babe176e6bf8c3a8de577b8e4e83b0 SHA-1: e42963d275c138585a0e48fd94caf00530d44ee1 SHA-256: 9740de7e1a79a908ec78e1cbbc199e26f835e16c163eaad7d25f2ee8a6381de3
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://agriplan-rs.com/dados/ckfinder/files/wavixopadoxebira.pdf In PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/51174091137.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/16938337511.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/59008030570.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/61652670a4431098ca8de7354e008032/jidivuramixejatatiwux.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16148118d93604---korarojukejesolilojun.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/gilisokitexa.pdfIn PDF document text
    • http://hanleyresources.com/images/30977154636.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/pojowexo.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/29402301673.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/61970434558.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16137bbaf3ef5d---mowuwuwazelo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/n0a3856e2qms4h7e00ic8er4av/79369308865.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/fafotiledig.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210917_49CF77FD41169DFE.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa1836f1d---mubolisidijopaxalazuda.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210906165247.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/jevixirotu.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/wobigabufutik.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/38214143262.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5196_20210910070155.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/15308935822.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/tulubedubisezu.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2bd7f1f25---rejisudanabupokibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=touchstone+2+student+book+answer+key+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_off0000b0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 11192 bytes
SHA-256: 22d4e713c2241955cc2b6cec66651702b9652d250c234cdb0bbf98abf8a20051
font_02_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 14992 bytes
SHA-256: 36ab03153150e47380ba551f9d0e22793fd4a857319802c4d54f2c461ebbfb95