Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e10738471b6b5a…

MALICIOUS

PDF

137.1 KB Created: 2021-09-04 09:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af24f8fdbae481182977c296baf7d487 SHA-1: 85de9754ade769b258f6db1301c5ec205bd80a81 SHA-256: 03e10738471b6b5a30044444eb8043801902922a9655de411f93f630e31f7025
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The document contains numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://drafthe.ru/uplcv?utm_term=chumash+shemot+pdf PDF link annotation
    • http://ambulatorioveterinariovianello.eu/userfiles/files/44045075001.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/kamurenovedi.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/tokegaxirugod.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ideml9mdtmds91i77qn7fvvd13/xopabusapo.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/powupamopemevek.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/maxux.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bad0cbaa---57593060454.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/kptu6jdrio7mk1ctkbcasafba8/44970366361.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9451dff6aaae3f2022ee4351b984e7f2/wapupugijowe.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/mivizepegupusukisesil.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/11466987234.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e62db00b3---zolaturigubugaxalujuz.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/99923929956.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/50d58e0e71ed87a6586b0e9192d16cbb/vekepej.pdfIn PDF document text
    • https://morabia.fi/images/file/gagivuf.pdfIn PDF document text
    • http://normel.org/files/upload/file/56659427413.pdfIn PDF document text
    • http://bakoca.hu/files/file/goxidigedudazi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be51705d102---7407230541.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1610a04b87daba---nalovivawe.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/biwelenakesug.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/dugitekosoduxosum.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d93546c362---11001790252.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/47094421039.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/5469320985.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_off0001b41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B41E 19196 bytes
SHA-256: 17cfb6db7ace5e065f4d9310682b56ca5b404661f169df0345eb3fb19fdd94a9
font_01_sfnt_off0001e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE68 10552 bytes
SHA-256: d4d7fab18b304424c903cf32bcbb5a0fa8f4487a889c52040626adbc83ee7574

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