Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcde4b2a581476ef…

MALICIOUS

PDF

78.9 KB Created: 2021-09-02 01:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dfd86ab9a77c659aadba7ffd60810b4a SHA-1: 0152bbcf0c6af9706817cc707c7792a1128f4dc4 SHA-256: fcde4b2a581476ef81d742d512931806ef32cfe275600195c00a1b409ccb55f0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nomylo.ru/uplcv?utm_term=lyrics+of+the+song+faded PDF link annotation
    • https://smartcrm.cloud/upload/files/lekuzogozuxivanogefe.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecb904dd70746d2a72a3b3e55805e49e/2077658640.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/92967177654.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/gaxax.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/volukokagolejup.pdfIn PDF document text
    • http://hifi-markt.org/kunden/kronhardt/ckfinder/userfiles/files/baxuriwopes.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/54816603408.pdfIn PDF document text
    • http://ha-sine.com/d/files/98286865487.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/84663848601.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nadazip.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/48095450127.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sufufojakotadaw.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/16425860286.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ea2f91de7---zukatuporofaz.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2bfbfa5201a95c13e65a477b63afb1fb/jaduf.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p599qbtlnohbff3l04d71effhi/41999121579.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/92192edf81196282e252ca47c5b32378/98085377001.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/mitiludamatusefuviz.pdfIn PDF document text
    • https://fishboat.hr/files/58700392843.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/58167263386.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/ed9jo6hmtqhrsbn5e97jk9q3s7/zerotegiviganulu.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_off0000cfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA9 10780 bytes
SHA-256: 86a9965dce2bcb9538240a2f2dc24dd82734f1bbf8cd4a7dc2c9902d359675aa
font_01_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 17960 bytes
SHA-256: 6c6767705a795f3b315b1ebbe84df443aa14fdd440b7619767e33c2bd89ad96b
font_02_sfnt_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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