Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cf6df8da7dcfbe…

MALICIOUS

PDF

99.6 KB Created: 2021-08-03 16:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 91ea2c9a99c9e06738780acdc4d09f17 SHA-1: 42a72dd1064dde7adb02916597419feedcec4777 SHA-256: 18cf6df8da7dcfbeb36180cfefd6271bb3a95d442834e8b438961c7097286304
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of external URIs and a link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://fereshtegan.net/basefile/fereshtegannet/files/videmovumudirosasopeme.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/vcliiv2o4nosrupjo8cblu8oq2/somepalov.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4333aae211592c6adacd8640d8ff9086/48332857500.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8da8c66ce---89560780620.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/912f924b25af9b93bac85a7b9034606e/35264800626.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/1fe154cd00db51fd0312b12cbc55e63c/12619940713.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a6a648074b97dfa0a8815955cb370b47/baxaxijutolegoxabu.pdfIn PDF document text
    • http://sun-tes.ru/files/file/paredifuvonotupaluso.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/36235865853.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/vivenajov.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c926ea68f8---zatupisiza.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/vofogeve.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/9448877694.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///zoporigivinadetogano.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/84441406285.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/75275340913.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/bipelapapemig.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/6fd02a0f8b6cf2c0e5f8454f19740fb5/jupogax.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160743ec6bcc54---99541220641.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd77ef80f42---xevilozos.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c69dcd9f489cf3019e20a1659694147a/bexazofa.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/55338989456.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kjrh3a1kagiohqql3j4jhil68b/80141094344.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dibujos+de+paisajes+realistas+para+colorearPDF 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_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 18236 bytes
SHA-256: e490c775f6fc41b5d8bd507f0f828b135adf8e74746259bc97a0d4c5bc348ada
font_01_sfnt_off00014dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DCB 10772 bytes
SHA-256: 6bd3d5ad77ee26581eea45fed4a19cadcdd622c09221983a3eb6a0ed9e898fa5
font_02_sfnt_off00016676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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