Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f8efc8d0a2eba2…

MALICIOUS

PDF

144.6 KB Created: 2021-08-24 18:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7798b37a64f5be888cf8631171bad32 SHA-1: 53b9844399c3d6506e24dcdeb00d85f233ff8b38 SHA-256: 28f8efc8d0a2eba2a332270629f124f9782459710dac0cecf69bf6a261f044c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://krisoc.ru/uplcv?utm_term=afro+trap+beat PDF link annotation
    • https://planet-for-events.de/userfiles/file/85019259950.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac178ed0603---52926771371.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/77b43891af42264d67c31198256d463d/96118171713.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/92187514231.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d663cc6c4---27993532093.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/36851859175.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i3ur2kfacu1f0ug34hhiv7rtvq/bobamofujifutugut.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7172d2dbb3---zimugizazaz.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/4297aef4cd2c864185229639090cc44c/fumagel.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b32d25918---zesulilaziwedog.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/ginowivikugesasefepob.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/41079611350.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/walevu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa15a8c917---pegowemamuwarav.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6fab30184---92418192389.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/regozawo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/52bebqjtv8ouabak2kqugcf513/25671343949.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/f394206026fef057df0d0c672df310a9/wanujigo.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072370043ca5---72477498560.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2c3psmka1k0h2atgdmdegp24sj/84129699253.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t67n4cvir7vhs0fcsmrh6fk59i/92242542710.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/dufofituri.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/pekokuxupilosesekajazajo.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/82939084370.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_off0001d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D345 10060 bytes
SHA-256: 514e288a9e81de8e6f441dbf1482f5c7a4ecdfa3bf80fb68da77b95dc210f7e5
font_01_sfnt_off0001e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E991 19152 bytes
SHA-256: 3dcc0b7c88392c240608452bc02c7a5aaff36f86d492b0849785855bba24b997
font_02_sfnt_off00021b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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