Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a9503104f4a021…

MALICIOUS

PDF

85.7 KB Created: 2021-06-30 02:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10746d5e0715aca702473b1a5181bfa5 SHA-1: 45c445fa709b5fdced9e3041021492c0fe9b634d SHA-256: 08a9503104f4a021e5f97af3018dea51026c2cdf673ecea6340aa19d37a9b16f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://medvor.ru/uplcv?utm_term=how+to+get+into+a+macbook+pro+without+password PDF link annotation
    • http://provia-events.de/pics/fotos/1/file/63064566843.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af76245e17b---ragakevenobedexa.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3akl5l0k4ccqkpfiih2b7ejjno/baredizuk.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/86761037954.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608afb19a965f---gibedefaluwivupu.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/dac3aad21d42622b38c334cf398612ea/negasovule.pdfIn PDF document text
    • https://luminex.pl/upload/file/37538362407.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/60488659688.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kimugebojaw.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/449d2383eca4e8c6585b5e4149cd55dd/63612433318.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/8dfk9utpin61sdmpki4ei4kth7/sowifigaximukororoziku.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/91415374937.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/68612473012.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2acefd610e---11451005688.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/47806426406.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/sikisalolafirasigupuvew.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/jixagawogosadenovo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607db41c87775---7629471990.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/mixomofiw.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/23003646962.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aaefdb36a---jijami.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/bab76d17f3b0da7cc7d0f14b6c4ed4a9/wolavateloxokisige.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/diloxukuwaxavaxedibevo.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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 17576 bytes
SHA-256: cc0137a8b29f5bd412556d300e321be95064d7e9b28555c18ac15ba7ee4793b1
font_01_sfnt_off0001156e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156E 11324 bytes
SHA-256: 490b36435b2beffd9193b4be2bcbcdf2f5034cc710929ffdffedbaacc49cf992
font_02_sfnt_off00012f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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