Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0b751818f8d3c3…

MALICIOUS

PDF

90.1 KB Created: 2021-08-18 18:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a39a8bc0b378d4ae46828adc61b771d8 SHA-1: 4d7dbfb600a110cbfc502e6b7812a0470d1b5e21 SHA-256: 2f0b751818f8d3c35d68afaaa4ac3a8002f77a56e3005fb5f0662ceebed1bb0b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning by directing users to malicious content. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=que+es+inicio+de+cuaresma PDF link annotation
    • https://yuanfuconstruction.com/ckfinder/upload/files/nujusiforukulekofoxoxafiv.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///76047706466.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad519e8e1e6---88061814087.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/buvutigadir.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/59333406727.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/61igkh9urih89brdq9nl3eppt1/52090510971.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/abadece1862e54f320bf5e6574bbe2a0/lubanizimuninutuliluke.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/26115947686.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/40649831077.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896daaab807---tuwobir.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/giroxugewuvujovajujos.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d054b190---20162628624.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d229574fce---47961875676.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf6b7e878---35132085755.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bixoxefipijeleb.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/xumukikoxixinewemomon.pdfIn PDF document text
    • https://italvaping.com/file/mopewolerezubupu.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c9164fc3---66304017725.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6286178711.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0588b7c4f---zegimirekog.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/0420987812bcf66e06ece41f8cd04f6f/nupofusoxuxowumukol.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ffe13a25---poxolidubixitajigali.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/xurokewopa.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_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 18360 bytes
SHA-256: 84de5c3e230f0d3758113bdc430fba36b759495ae4320768763da35522cc7915
font_01_sfnt_off0001285f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285F 10548 bytes
SHA-256: b1ea9cb84be75423930dde70f8cc00252b4cdc8ab2f89a4057ddec21c7c17589
font_02_sfnt_off00014077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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