Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16539f9f1b2cd7f…

MALICIOUS

PDF

91.3 KB Created: 2021-09-07 04:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 8326f6adf1cb2049d1fdf26d88d8a204 SHA-1: 500e13dace683b5bbfa00cf5745f154c910d6abe SHA-256: e16539f9f1b2cd7f3ea5b5aa92b5086fa9805b2279a967758de157bdd268e8f5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

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
  • 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://zulassungsservice4you.de/bilder/file/xijef.pdf In PDF document text
    • http://dui-antidote.com/images/userfiles/file/72148612364.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/xawikasijizusarobaze.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/wedemakukovot.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3e085df2c6e742f7a23296f678764f23/bolexugegepoxis.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/8e4ak9l9hn6sut35kp4hjg5ho4/doxozegijowa.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/18746237607.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/81176522056.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/395ea1e9e78421f543047d6fd6f8c913/91531827532.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161002482c45e5---23473178149.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4b1017c977150b8cf79b161d6c4b675a/kolirawinigerorowat.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a492fe0c0d2---bajobatoze.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/4710932204.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae98a5af47---97320380785.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/kagibe.pdfIn PDF document text
    • http://bulmarconsult.com/files/10838831598.pdfIn PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/88211998555.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/paxoguzukusejuriwuz.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/96523246632.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/21264395928.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e42e4b63a---budibefubatibiliwedi.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/24162118174.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c51e633051174d526336c9b2fd6b45e6/69739717767.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/ac222a8090340f3b6d83d43c53198a50/97896877697.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/403c65f9068422f2222243e71b6dc658/dexanilajeta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ancillary+justice+ann+leckie+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_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 18136 bytes
SHA-256: 0e17aea3835ddd63559d4e2f486fa9b7d7fd66e850edbd55aa39db6684d63281
font_01_sfnt_off00012e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0D 10908 bytes
SHA-256: 8cffe040870e3fedfa4097be613f78697c0200c8f52a0ad2ae4c8269fa58e8e5
font_02_sfnt_off00014775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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