Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccccd00de85180e…

MALICIOUS

PDF

72.4 KB Created: 2021-08-31 14:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88b29c70521cec839ac5e810dbac1cc0 SHA-1: 6c359770cb32b3c87e02797ef26c40ee9c12f6be SHA-256: 4ccccd00de85180ef90b898f01e3af2f8edb4d0d65b65cadac28adfddd3d6431
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains multiple links pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/6gg1pnoo058o64jqvmjqthddr4/80983604992.pdf In PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8141718b28a8f61cbb246de82588fbf6/biwiv.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/lexebokekedatoli.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210616013426.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd614fc1d---lugugelamekupolu.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c996d916c1---bisituz.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b918ef81856410a348f1b96b23139da6/28149797265.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/26057766021.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210521081614.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/bumexisiz.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefb527048---gazewakoleguragukod.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4f792c0be1bf90e17d7a9a88641d29ee/tijofuxewiwifumoge.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///40715951679.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/81657188872.pdfIn PDF document text
    • http://zuche0551.com/upload/file/72394717228.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/fezelanibaver.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/toxumubakezulodetagigu.pdfIn PDF document text
    • http://canoeing.by/pics/files/36833894228.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881d187e445---gosixuji.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f57504e8---75769213713.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/gotuvivibivozax.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0199ce8e0---xulutabefiluvofoferifowa.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0c6906298---24404163775.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f8c178ff---3345291727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=write+off+meaningPDF 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_off0000bcbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBC 10336 bytes
SHA-256: 7d326c5235ed801befec46966c23ccca8cc5264252e64d4e8373f42fe0d12f2c
font_01_sfnt_off0000d410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC22 15884 bytes
SHA-256: e0c95f4b5da2e68893d8dbf2fb06bfc2071fedea5317a7b2592b37304b232e0d

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