Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a522ed11bfcf1e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 01:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 86ee4873fdb725a2fbad94822b116bc7 SHA-1: 58657970d6c7c27a55c960c70f5c3d2005125512 SHA-256: e0a522ed11bfcf1e3342314707abe09ef5ed6fda5c4b9ec1db34364888bf7fe8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/59925883198.pdf In PDF document text
    • https://aporpeter.ro/userfiles/file/japefel.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///7468906854.pdfIn PDF document text
    • http://salonrowerowy.com/userfiles/file/zikide.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/jexariwonowowamelonobozok.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/89609871025.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/24829228433.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-11/20210911171801985996.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/kiporugidowejobifaro.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/74029710184.pdfIn PDF document text
    • http://www.heksan.com.pl/file/89622892880.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1bfce5b65a4c4672eff721c3b3dcc13d/31057231745.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/ramonevofufewazetowis.pdfIn PDF document text
    • http://cssh.es/img/file/viguzazabonegabodu.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/wudutovakiwarijexal.pdfIn PDF document text
    • http://bankerz.in/qpic/files/muwegejowobewawibabe.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/24859944848.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/39263573645.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/60890083124.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tarutokijixi.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3iltp0ffe684t5vp4evqnmnfq2/tipetakevovo.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/56163356616.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99937301c---39938163629.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/9324924566.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145abcf6161e---gafovep.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/mofil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=unblocked+66+basketball+legendsPDF 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_off0000ca0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0E 18576 bytes
SHA-256: 373ab2716705f2d562093b4e4f5ed7227cb6ee74c066cf27f6e60e7bca26507d
font_01_sfnt_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 10760 bytes
SHA-256: 56c230abcf5b1ef07585faaa169f3768699d4c70f9987d68aec578ccd1155097
font_02_sfnt_off000112d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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