Malicious PDF — malware analysis report

Static analysis result for SHA-256 dade7e548143ecfa…

MALICIOUS

PDF

82.1 KB Created: 2021-07-10 03:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 52d8ec58b684a6752edfd5c35c16f3db SHA-1: 9491ee0dfac909735003822e44a604c975f8250a SHA-256: dade7e548143ecfa9f60029f65d99d20be27ac3d89882b7f598c01b1c7627cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to multiple compromised websites, likely intended to host and distribute further malicious content. The document body is unreadable, but the heuristics strongly suggest a malicious intent through the distribution of links to compromised CMS uploads and disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://songhong-thudo.com/img/files/ludid.pdf In PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/91314850321.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/06a7ea234b1c084770b6dfd7743ffbba/26382203317.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3714da0ad---73420545940.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/29281315696.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa5a1ea54b---54264363482.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b60a57c58bd59c0bac21da155d7cec6e/xesuvav.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d5f2fc9684ea7cc5da49c1afad74b41a/93344706040.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/regabuvadafevefuxuvorog.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071224ab6638---87245291698.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/84435846368.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/mofoganosijotagefimojoz.pdfIn PDF document text
    • https://patc.fr/imagesfile/xitogoduwud.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9ec4b1f4c338b38c8d07498ed8d204b7/20358976163.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/4b2487fc4b02125da83571d1afc70353/83490435372.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/15c20a4c7b2976b062e8830ecf003cfd/wipuzon.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/10495687280.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/13350850598.pdfIn PDF document text
    • http://fygl.net/uploads/file/180617401253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=international+board+on+books+for+youngPDF 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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 18660 bytes
SHA-256: de8f3af5b754553c8d0dc0fe7a4fb9ab851ac96afdc88d1ff81289de517b2d6e
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BE 10924 bytes
SHA-256: 2e5b824c8d7ad187eb8d818767be8c641f7d655e59515426094c4bd778cb32a9

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