Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e9d6c29930d184…

MALICIOUS

PDF

84.3 KB Created: 2021-09-09 20:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d543da71f1b809dd2fac68ee39219bd SHA-1: aa8ed12c2b95e7f5aab64a3a84f960f390724701 SHA-256: 91e9d6c29930d184c14bd405b308b4e66366cf82d0558e2b2c87fa2479d59131
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.serwkom.pl/plugins/ckfinder/userfiles/files/70275461321.pdf In PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/dejuxegaxijevugenug.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/79101456876.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/74236454264.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca97eaefc---47737335921.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/33477807407.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/90506847758.pdfIn PDF document text
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/mumugabojolavegorumu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161307bdf675b7---81553838569.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/5a2e98611861bc11189e0dff0e7ee2f7/nubovabutixet.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/sexemanexewaxogogexixof.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/gavoma.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/38137180598.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/38418617998.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/23607744227.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090105375273499.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/dilovusufaz.pdfIn PDF document text
    • https://nada70.org/userfiles/file/6810337115.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133216fe6d35---10097508245.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/175e7cd79effdc4242c92a9121ce4a87/subalinafizudovejarorini.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/38691832455.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/zelixizekusijopewatuxipef.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/kumipisututemudaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=absolute+contraindications+for+massagePDF 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_off0000e456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE456 11040 bytes
SHA-256: f130f2caf36406e35d853d9e5a7e61cc9f249665e81345e41948e02fdf974dde
font_01_sfnt_off0000fdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD1 17492 bytes
SHA-256: b197c7c8322e1140ce9d9080874d15ea51259198a53cddb17d2de81a7d4b50a9
font_02_sfnt_off00012b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1