Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c923008ac3cd9d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-18 17:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5dd8f44c757b3151daffdb8eb8f1cd15 SHA-1: bc800f15b789e98c965c7e1279539c3aeab85c5a SHA-256: f4c923008ac3cd9dba09b459ff813706f4740a2de45bed37cd5327012bb7c442
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://drafthe.ru/uplcv?utm_term=arkham+underworld+apk PDF link annotation
    • http://axwelindia.com/uploads/kuwomusejigefipovak.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/48155588198.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b0cde458aad07a127cdaf59120dc450f/87172755749.pdfIn PDF document text
    • https://bachson.net/upload/file/nubazapiwiderun.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/67388483595.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/84243318005.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161314a94a0dbb---zuwizasolefujasedijexopu.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/8286210518.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/peliwudegixe.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/57272569948.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/tekepurapulowenuk.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/piwifivobupafav.pdfIn PDF document text
    • https://dm288.rs/slicice/file/luxazokosalulaloduf.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/paxupikasuses.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc2ecd91c---21636270618.pdfIn PDF document text
    • https://seerupit.dk/assens/file/zuzixowefidomesito.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/59454062310.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614207efe4a27---fikesagosexewu.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/dulafozejikubawudos.pdfIn PDF document text
    • http://jar-ted.pl/file/zawovokimedebora.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/05db6ba48c19e2dafdff4e8b35bce4c7/7115064973.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/doxuredodovaridatejaxogo.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/26308306293.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_off0000b7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD006 10560 bytes
SHA-256: 2d9bc986b6352c06c38db7410b0971ee02e4f994ccc3dd394ff37ff38cf5eea8
font_02_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 18948 bytes
SHA-256: cd5d52853b2d862fbe71592d8f457bf469a53c804e1907410e181f6c7ed27839

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