Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff2c8a235543120…

MALICIOUS

PDF

89.1 KB Created: 2021-09-09 15:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4e232f2ac1f943e98b8c75de3f643542 SHA-1: d22851e144147b191d733d1625da8db5be5ea49b SHA-256: 7ff2c8a2355431200e26d3217a7d6019a57cfe4aacc4cd8fd33f8fab606102ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs that redirect to compromised websites, likely as part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically related to phishing. The presence of external URI heuristics and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=minecraft+pe+download+in+android PDF link annotation
    • https://binarbaidequipment.com/public_html/userfiles/file/65754426766.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/pasujifasejafivu.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/loxititepabebesuxataz.pdfIn PDF document text
    • https://badrivishal.com/media/wuzokisinuresa.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/xiloxufiganazubomatazu.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-2/20210902053351599142.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vifobijatiwukuvul.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210904_FC5F044C25219495.pdfIn PDF document text
    • http://hmed.vn/upload/files/15145531265.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/c8c0f0c085598bb3abc781e7119914ba/85895900719.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/vudojasozalalonajedumi.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/9237856122.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/fojadobemabol.pdfIn PDF document text
    • http://hk-keber.de/images/file/sufofiramutegoxi.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/tifarisudal.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/13815291832.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/44c63ced32505069457165ef1f3b7d5a/65211174273.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613341dc8b9c5---21301527871.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/11365167005.pdfIn PDF document text
    • http://royalwedding.jp/images/blog/file/79065546739.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/26317684838.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/27408897371.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16133efc1cc7e4---4536748381.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/34343643735.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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 19100 bytes
SHA-256: b33e2eec6909c45eedf4ac2bd3c828e9609cff8d6cc10a501271cc12a67d0d75
font_01_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 10524 bytes
SHA-256: 11ab81c8fe31ec38c05e9f62853caadf42b83107fb1dd8b17166673c0bf3d28b
font_02_sfnt_off00013e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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