Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9221203d2ec2fe2…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 04:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e99e46024c8cd3e6a97718586773809 SHA-1: 300e9f41b7b57abe54ec7bebc55965d60c31fe8e SHA-256: f9221203d2ec2fe2733389caf9652ceb6f6de02ec6ef2324b63121866f08d5e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload directories, 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 presence of multiple compromised CMS upload links is a high-priority indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077be8e9ac2b---zikadefojatuxavotup.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/01806a9177864524c967e52cd335048b/52196783452.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/waxalele.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/kijajelokap.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/26394754887.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/nutazit.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/boxenoserezede.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb66021ffa---90044461742.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/wuwuvigutemunedobap.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/parigijet.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/tusovo.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03379d0333---zotudofefiz.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a191e85d486---72820936270.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c49b89672d1---63322128171.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4079288de6f17ec2dd010a2fa71fe75d/ponanakeruden.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/parilesugemoxetutaw.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/92647394620.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/kerenuzimer.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xuvirakukuleloximemoral.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/53437093491.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb8bf68c17---kafewok.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609dacf0a04b8---55041128485.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/47155434405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=have+to+has+to+worksheetPDF 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_off0000dd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD63 18572 bytes
SHA-256: acdbf46eb7550e0b30fc3aef6e58b874666f7a355e5a568d9f4ebaf614842b98
font_01_sfnt_off00010d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4A 10196 bytes
SHA-256: c824850632aea33c2afde94f353088b41c9556a5f8c489b66bcd8f51400ce216
font_02_sfnt_off00012465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1