Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3df43b779950dcf…

MALICIOUS

PDF

77.0 KB Created: 2021-09-23 20:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6dadef0aa5c784021cd08d39a90bf004 SHA-1: bd68c972d941fdc7242b4976b3e0dd8162d0229c SHA-256: d3df43b779950dcf1e19712e7c1bef8bff2bbf30bcf9446fdf754f1e15a49892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • 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 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://inwebjor.ru/uplcv?utm_term=sega+master+system+apk PDF link annotation
    • http://bibliotekaludwin.pl/img/upload/files/xegimaganunovugev.pdfIn PDF document text
    • http://artio.pl/files/files/lomexedab.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/4955698570.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/lemilabuzobum.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/segobuzanakukirud.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0db0a06ba---fewumer.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5565c30f37b6dde9e45d48e0d9d0a3ce/90666758021.pdfIn PDF document text
    • https://korankertas.com/contents/files/76028106908.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/37857727767.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/67621069075.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/24325447974.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/ddb2132701eb60e82ffb094ad1f1773a/tepakakavetibiros.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/mepamuzumiwefabaxatexavo.pdfIn PDF document text
    • http://cocoal.com/uploads/file/97048230841.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/87742292010.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/tuxizabixamoxofikosag.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/79911416390.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1f071c72---53723845477.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7f7e80ae270d3d945315fc25dc09ae8b/31928443497.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/menanezitadijigazo.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/36479165381.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/27049326863.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16139217674e39---98376890716.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/vufutedawof.pdfIn PDF document text
    • https://la-klamm.org/Files/files/9781507190.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/vilasurivukadumufa.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/joxilenokerewaga.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_off0000c87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87E 17648 bytes
SHA-256: eb9716dacf8fd90e38c03ccaf5ceea49b6337a5c79375939c3af7ebddcb7c905
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 10512 bytes
SHA-256: ea152b6d7a6aca48d0d3a21a8a5915248677c7a7e2170509474a8fdf97b945ea
font_02_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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