Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf513b4c5bd71966…

MALICIOUS

PDF

79.5 KB Created: 2021-09-23 11:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c922fb4b1de89ea87b40eab53d7a3265 SHA-1: dfc0c40620fe8f0828575edd98b0c9ae6db08ec7 SHA-256: cf513b4c5bd71966741862b06d67d2238e7348b5e5bf9ee5716d9cd8b745e329
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, likely serving as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://ciaomamma.hu/editor_up/zakipujebokivelopewipewi.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133716691551---sutosusivog.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/valuxanobibinakuwo.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/3861848121.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/77466600464.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/zakatogezamigosajuvulu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/24495093888.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f376kqtrq9d1dbtu2vd75k2jh6/36662464012.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/24351488699.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bfef33e6e---fedijidutomosefagojawok.pdfIn PDF document text
    • http://riverla.vn/uploads/userfiles/file/14069552047.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/zukazaderadumakixoga.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/duforefune.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494f571e906---lolidekavotawopebu.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/mekovesibimozav.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/96419627009.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/dizedenimiretofepaluvi.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/35023731612.pdfIn PDF document text
    • http://enricobarraco.com/files/risabenegisivuz.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/nozevi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161407381b4757---39583801988.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/92209658792.pdfIn PDF document text
    • http://gartenmessebau.de/uploads/files/mozasomudel.pdfIn PDF document text
    • https://ip-pharma.net/data/files/jenomozuzes.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/jidomejexofivalubor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=instavevo+apk+downloadPDF 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_off0000d26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA81 10388 bytes
SHA-256: e818ca34941390d4ac768ffd3437b5bfa284dc60019010463737ab9b5dff41dd
font_02_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 17868 bytes
SHA-256: ef83e98143763a5cf85cc753db2c82ce5d3f2489c671ffca1655b631f136eb46

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