Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d519c780671ec6…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 10:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bbb512271239b273b3a0351804ac8ed2 SHA-1: 5247314b6b96c7d463920c7202c8be1a7d59f0fb SHA-256: d2d519c780671ec6c9efedc223e2c396db9041a682a4f5d4aef78835367c2a68
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to other PDF files hosted on compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://wastran.ru/uplcv?utm_term=210+nm+to+ft+lbs PDF link annotation
    • https://bostoncake888.com/UserFiles/files/33774661862.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/badije.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7006747977.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/70028398943.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/sonuxixevuvusavusu.pdfIn PDF document text
    • http://ahknchem.com/upload/files/47532611254.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/debumumubote.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210828_607DC92B025E83BB.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c16744a70d.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zufonovub.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/41908934454.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaff1b3201---50047092180.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/69090489428.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a71a296b88ad9f66c5a12e9c11f00d35/gavazuvojugafinan.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/23440433863.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607560a4d9882---78400819667.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/zipufopewokisudekiduvamu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb053739a3---tifinuwavejuxanoro.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/54960264150.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/9de463dc6e3b937036e8625ead3326da/fibasa.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/10841498870.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_off0000df9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9E 18240 bytes
SHA-256: c7a3cac3d1d0850d47364a471a61a70f17c3727a2245299e1c871a3cac87eae2
font_01_sfnt_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 10224 bytes
SHA-256: 5235d03721b472214f9ff59749f643c05b14458d47115939103c631304527389
font_02_sfnt_off00012638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1