Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ddd0d1b3c9d12b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 12:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40fe588a09b10633d62df021477b917e SHA-1: 891d3e4818470648e824a755c63328f296e3a9ab SHA-256: 28ddd0d1b3c9d12bc9135cdbb36db8b3282b748ee82ff868d4fd66231dda79b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The PDF contains numerous embedded URLs, some of which are hosted on potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://aiswaryamatrimonials.com/fck_uploads/file/46962216936.pdf In PDF document text
    • http://interno-kazan.ru/upload/files/sijutaxuzimurajawe.pdfIn PDF document text
    • http://ailizia.com/userfiles/1508210344.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/fumilobewiz.pdfIn PDF document text
    • http://edallyshop.com/upload/files/vebawuvumigirez.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160916826aadd5---62592532730.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/skh0cephf4492hkkf17a15opd5/kovoke.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bec820abdc4---35857848662.pdfIn PDF document text
    • http://russia-ex.com/fedipexuvemadexexorisa.pdfIn PDF document text
    • https://termoformat.md/img/files/72476870011.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5bebf23b2099f1bb05994e6812cb6258/jisogora.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/65112030957.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/92428393319.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/90672986436.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/89452955616.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/83280670013.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076b35d89089---22759077715.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/59996278881.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/7pobt5dct7dsirijn6do7ubvu1/66711699600.pdfIn PDF document text
    • http://trungtamdaykem.vn/Images_upload/files/zilirowubiguxanuwofobu.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/merera.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/dawetixodidojasuvadezul.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/lonuvatudijavile.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/xigoxudijatavofes.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/duluwojom.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xeruperawedufikoxu.pdfIn PDF document text
    • https://fultoys.com/userfiles/finalugesiwikudifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=infinitive+and+gerund+quiz+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_off0000c073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC073 18420 bytes
SHA-256: 5e558e935da4184f25e75be6c23f3850261825418ceab924aceb354855859020
font_01_sfnt_off0000efac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAC 10660 bytes
SHA-256: 81c7566d071b7651a9a3378d236b386a00a9b49bb0e56eb7d20b8209fc831773
font_02_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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