Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5e65134ad490ee…

MALICIOUS

PDF

85.6 KB Created: 2021-07-13 23:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e225127a3367ae4032d9a5233baac662 SHA-1: 948f3445d9d99543c298e57c493494fdb88e14aa SHA-256: cf5e65134ad490ee6d176ecf4af13ce253a47afd4a5d768e93885d60625479ec
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. The embedded URLs and link farm structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=do+book+titles+need+to+be+underlined PDF link annotation
    • https://barcelonamedicalcenter.com/files/galeria/files/44234867607.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb0e6dd5a---68970295820.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/borumep.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1235578fc---12255581361.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0f5ae6f379cbd59bd86079f2164921d9/25423435811.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/silezotupo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/19fjknrnfjmu4b72n8r03abi27/251496915.pdfIn PDF document text
    • https://soechi.net/userfiles/file/91896203731.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/paxejaranevovujagobon.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/94778793241.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/nuvibapaloxamilurigasid.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609059986fd8f---25823206725.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/739ebd2065306c69ea3ae3b8b51978a1/finomolosivoziviv.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/65195120770.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/pefirujevemuluf.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/23769838595.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/rasagitadowikovixidasot.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/75169293940.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160772a3822827---58210601563.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/leramosuxisolomesamudedo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d2a25882---9344506811.pdfIn PDF document text
    • http://bptramptour.pl/files/file/fulomiko.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/wufumanukiwitorafug.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/oc7tdbol471vd0b8becmquh2a1/40488923308.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/528f6d682e3f3ec537311056e94ee5cd/lulezinekakewe.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AC 16920 bytes
SHA-256: 906bc877a68d0a68a262efc0b5913d76cc085c45aa20ca176c2c272d9f400bb2
font_02_sfnt_off00013146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13146 10412 bytes
SHA-256: 2ade633a25c525611853a6ed1ae35fc96ddb961a6ae35353f7ee7b97d35b31bf

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