Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e413ed84c63702…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 13:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 49b995faf669232a6e5de0893154f72d SHA-1: 9a5a2b1a320f50e0037c0a39c6995e2beff01e03 SHA-256: 25e413ed84c63702584ce491ae3f25c2b9a71a83872711a7134a6e181ea28ade
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure itself is a link farm, leveraging compromised CMS uploads to host or redirect to malicious content.

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.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/vv0iuu0571u33vavmvi1h73bq9/14838125382.pdf In PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/vupururasirurezurip.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/xugid.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774251ac7ab---turedowegifexazax.pdfIn PDF document text
    • https://luminex.pl/upload/file/66691145027.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfd570a51a---28978118350.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/dibewajara.pdfIn PDF document text
    • http://fotossc.pl/_files/file/50084310426.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804411d74e2---bifuzavokukipanelimefikup.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968a09817b4---8276668587.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/likizegob.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf887be523---fivaxubesixevo.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/sovesedugevoziwusanireni.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaf083cb49---50297666760.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/91981355169.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609152bcadbf0---46745751414.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/woxuwebeku.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/zomumijudomevuwij.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/nuxizavufepolixew.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a47c66ad2---sufotiteleweripezol.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c966ad46c843850d3f1aa2ef71db9326/sejogivegisoribemamogiguz.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/59121342822.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e02b19891c4---nodefujejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=biogas+utilization+for+cooking+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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 10968 bytes
SHA-256: 2b0d1c4e6aa1d5ea92146376b1f4ebd9876d8121822f12de4430a58c88d9b016
font_01_sfnt_off0000eea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA9 17848 bytes
SHA-256: ffc2f363a722e49e48af658f502f63ce9bd2c2cb2e4262d0aaf8ee4548f8ca66
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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