Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b6d783e4ee9930…

MALICIOUS

PDF

67.2 KB Created: 2021-09-23 06:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ea903eef32b194df6c3e33e2fb86d90 SHA-1: 5cf5ee9a56ccdaeae05f59cc8c8fb95a5049f2ee SHA-256: 99b6d783e4ee993038351d7d195c8b85c88700697e50cb8ada401dbff9f9c3b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, and contains numerous links to external sites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the structure and URL patterns suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wamaeassociates.com/images/uploads/originals/file/34241585964.pdf In PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50356724208.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/deluxofumikovurubavu.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/11536633490.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137fca3483bf---6683437037.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109191027457463.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/12645737550.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xefexizele.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/85421912443.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/64e982ca2fc56ea541108d9f86b7aa99/jagorokuxufavadaj.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/9r6bkejg6o5i27cab7ml3cleq6/tarometobanoxetip.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/48692723260.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/jijugafidaladizoj.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/17384487871.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/zowasuxupeni.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gividuwajit.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/23793399979.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/55014113062.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/wopasaxawumatogolu.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/famusolifotekejosevamoke.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/viwogutovujulezejavax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=advanced+iq+test+book+pdfPDF 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_off0000abf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABF0 14016 bytes
SHA-256: e47117f1d1da41e334842ce622d399d5c1c050d32ffb36a23d371d26fd5adf2e
font_01_sfnt_off0000ce85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE85 10892 bytes
SHA-256: 73ca9d3c43b1f045e5c2db638639bf277c3006f5ab6c8036003f18f9d15ae9ec
font_02_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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