Malicious PDF — malware analysis report

Static analysis result for SHA-256 1075c89a6cdfc089…

MALICIOUS

PDF

98.4 KB Created: 2021-09-07 21:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a7fa4331cd09fd7a7c252d7d9096adaa SHA-1: def7e84d33eb948912cfd6b095e616d2e12760f5 SHA-256: 1075c89a6cdfc089c77e79b9eca988a58257595e821665cd8fbb75f9f3baa3a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://asiquim.com/ckfinder/userfiles/files/65296999587.pdf In PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/bc4fcdd7b6681300faac25c33372f0ee/86589283534.pdfIn PDF document text
    • https://munord.com/wp-content/plugins/super-forms/uploads/php/files/f0fda3aee6b422bdaba86b445883ee1d/12615176834.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609a244527f60---88165157454.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/52485180178.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/lexijamubutotiwe.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/92b0cd3ed30c966225cb8321a1eb65a8/36781688827.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/302f0c0e26bbef665dbf086273166403/xadepefozadigigumo.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/fezafa.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f2a9f287953c8256062154bc4884d2ed/bafopinadoleso.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/porali.pdfIn PDF document text
    • https://mytopics.it/uploads/file/kubivavedopanuxe.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/webukuna.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/oq3bigjdjt4ohbtltmt85arsd4/61881997128.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/63718245079.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/6e356a3d037bad73ed02cc0fdfcbe5ae/gefovopomipulinebupebum.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/faluwekokuzopekisevupumap.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/fkk3qk5jih0nl7bovvh8t64em7/wavetilotaviwovot.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/fewawevuwivurilavuvuw.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/u1cuu7h7ge01au9k051f0katf1/dasodifepifisux.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd75e36330---mupokotibufopilezawo.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0278a550---27894304428.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/xubekedupimene.pdfIn PDF document text
    • https://lasanisports.com/files/tatunafaxepas.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/55722083087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=introduction+sur+la+pollution+de+l%27eau+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_off00011a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1B 10700 bytes
SHA-256: 2e37e27f44b23000dac0f4a9bbd5af0ab6aa934bae712e42057d3922e1116d4b
font_01_sfnt_off000132cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 19272 bytes
SHA-256: e55c3e2aea5354c8191a1d3289d0ac588549383e4ac3a69e06c65e338496c249
font_02_sfnt_off0001639d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.