Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fb025dc1241a8a…

MALICIOUS

PDF

78.2 KB Created: 2021-09-13 12:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 48cdcc15e1d1fa9b5666cff2153580c0 SHA-1: 4ef1ca8d5e16308c84f0b9640f5ce5b16c6fc878 SHA-256: 73fb025dc1241a8ac6c1d59477fa1f5152238ab7d81e24a85363899a70b3f638
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript further supports the possibility of malicious code execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=dil+apna+punjabi+full+movie+download PDF link annotation
    • https://pacantioquia.org/aym_image/files/17251299455.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xisagisejuv.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pejonelidibogakizalibag.pdfIn PDF document text
    • http://jawarakreasi.com/file/14012588816.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0321e8fdf---xamaruvemulokupuj.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/42061522728.pdfIn PDF document text
    • http://rayanchem.com/d/files/37224229104.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/3elcvn75bhmv7q9fu7d8d5fthv/70943370455.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/fudawafutemaluworogedo.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/wexutimu.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/vovibasirizifobidaxaluri.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ad6811d24---xuxasifidegurilix.pdfIn PDF document text
    • http://inistor.com/ufiles/files/63464531969.pdfIn PDF document text
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/32851374816.pdfIn PDF document text
    • http://ternovykh.ru/content/file/61234289768.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/76599315109.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/20617742286.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/27206174920.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/65531570518.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/fiwukomovaz.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/11062431369.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/rugojewejutajerulubege.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_off0000cd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD39 10816 bytes
SHA-256: 6141c75e4ea93bc038d25246bec972438e1816480166ebd94d9dbc1fb6b37b30
font_01_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 17328 bytes
SHA-256: d06c051d2a17a43cab678209510ca5ae985ce1c0d8894adb38e90fcdbf01d2f2
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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