Malicious PDF — malware analysis report

Static analysis result for SHA-256 c619eff047472dfd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 02:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1fcfd6ea0aeef1f563c340721c1b0985 SHA-1: 56b6ad73b7d64813ddfdc617f7809a6f9f30c152 SHA-256: c619eff047472dfd594103185048e4fac017dd4d2b9b7bfe2a992be778132a47
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607988f532a70---jamaxodiwuzi.pdf In PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/putabuxoruji.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/safesosatezilizadowurirex.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/89981441599.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6c81fcbef4db4a59c957da89291b0c98/zepusutak.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/pakegoxapif.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/avn988hcof9u35rc404on8csa5/gasenubitazofolowemes.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3c6ce12c566df535f7ca487cd2537352/wabonutabuvojiw.pdfIn PDF document text
    • https://braus.uz/images/shared/file/76419145589.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/67566768472.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/kivalepedug.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/je2ooa80umrri9n5ot3dhbe934/nopinamubuvaxogakokimawe.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/33799971258.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4qc383e1ba5irvk2vkgdcs75b7/40552228836.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/1270710aa1403a6ba6538c94c8be0ec0/gawinudefe.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/rijolenaxubetolanijipufiw.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/33408045962.pdfIn PDF document text
    • http://dchs1961.com/clients/871949/File/61280539657.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/razumovebadilodokej.pdfIn PDF document text
    • http://chipgene.com/image/files/20210706_050643.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb3f4bed3---10436701140.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c83510e3b---98075328998.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160d6c3b4ca51a---39675785883.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/82490629042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=create+man+in+our+imagePDF 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_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF31 17280 bytes
SHA-256: 33422f62a98bec3f317ad86242c82b91897cf50b8a81cc02d56362b93f57b214
font_02_sfnt_off00012b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B39 10368 bytes
SHA-256: 610b5d5753202674ec7badfc3b6e7f9c254c301e154e35913395c2876324e7ed