Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5231c804fd2d3e0…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 06:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a589a9a6bcd1986f39c14bf5b9b7b1df SHA-1: 9effdba079779880fecaa8ea4203dd328dfc8180 SHA-256: b5231c804fd2d3e0906cf736b0aac3caeabc3617629c347e6a5cd913377590a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to manipulate search engine results or direct users to malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://www.leposeur.fr/site/upload/ckfinder/files/53859866506.pdf In PDF document text
    • http://chelseafoodmart.com/uploads/files/93075794313.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/kifuseguzezez.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb85687519---84493882301.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/kemewusetaw.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/9e017e06acc16bea6f30af17cea3ac41/ludazuxodef.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4174d32082---givonaw.pdfIn PDF document text
    • https://xistenze.com/files/files/nibaparedog.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb9bc4ba6c---pipagubomo.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34a521ac7e---fesitolinowitozinupuja.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/64098511013.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160703cb29a35b---4761297846.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/83739385049.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/riraberopozimetifiki.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210630_151700.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/58145946713.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qkqpo2lande587u2v454q7m915/zoporuja.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/85224846645.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c957ef2d59efe8301554c0bf95520c4e/92332424031.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/kukusagagerodudote.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/pepiseralemepejatawubasib.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/epb1d2ph8a79ot1ts2h9gpap31/41797351557.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/dudoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+measure+ring+size+in+cmPDF 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_off0000f805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16744 bytes
SHA-256: f1c6d6b3541473aa7f9f887fda68225e67e22cac4f294c7bbf40cb9db9b9b4af
font_01_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 10764 bytes
SHA-256: d851c2933fafcb0fa8b12966f2f611df09f928ba471bc51b39708df571024a3a
font_02_sfnt_off00013c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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