Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43bd02032c21bf7…

MALICIOUS

PDF

96.6 KB Created: 2021-09-07 04:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 304afe0e3f30708040536c39fd9899b4 SHA-1: 9b5fa1f1951bd69401563e0d2eb7f72d7453ff39 SHA-256: e43bd02032c21bf779d367743b5d3e633e59ce049655c25d362e960b7c48e786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or spamming operation. Although no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088815eaeef6---kuwutom.pdf In PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/wigagonusezuwigi.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608922b088e5c---gifirixud.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608460a1354ee---83892917324.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/zalejibude.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/19ea3103e07849f79c2042ea7197a2e3/89549677759.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1ehe0d69q8i79en0gkilv5m2rv/80919508647.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/devofexukunevoxokarujob.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a904ba8d1ce---nodowajexojizado.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/961fea309b8d0e2ca2de8da39968ba83/musokomujutapabobowuwuzu.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/kutazowaladum.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bopovujusuluv.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/bidufajeritomixofupik.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/69250706659.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b7440649---79776431141.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981c8ace34b---julutuzafupafixagorerox.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/32636003038.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e409c6108c48455b272fe2006a52abb4/gejakanubewus.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/2943283652.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/h0aqj3lkt4at2u1kh5rflffjt5/65274522890.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/84b84c4aacb51dbd11166c7bb3d66128/27629420595.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/22474183249.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0bf728efd---27733348911.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/vuredilugesekasodunem.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b0b9008664429221dd5390330d39c6ab/36969962210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rudolf+bultmann+livros+pdfPDF 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_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001294a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294A 10880 bytes
SHA-256: e19b27baa357e367a4438e46fd2138927bd78e15f941e8572fe455afc8688111
font_02_sfnt_off0001423a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1423A 19872 bytes
SHA-256: 4aa1603293ec8b3a221a43872ace72098ddc23c3b4c10da3836bb0c56dc0aa27

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