Malicious PDF — malware analysis report

Static analysis result for SHA-256 c29c55167a59c2e4…

MALICIOUS

PDF

84.1 KB Created: 2021-10-11 02:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 386ba019c4096ead070eed77cd75d2ca SHA-1: b70e03519c1b2e3cbfb2abf492230aa066132f8f SHA-256: c29c55167a59c2e4255369d58681e256700ab9225d2511d32be7f587669906ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://lexprikson.com/admin/style/images/userfiles/file/tawud.pdf In PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16160d2121f50b---zuvasoponamenago.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/gituwu.pdfIn PDF document text
    • https://linhan.xelinhan.vn/userfiles/file/vigemupuvaseriwu.pdfIn PDF document text
    • http://hueide.com/upload/files/20801148656.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/71196690d1cb4190dd7a949a6197a412/67935758244.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/96171334180.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/wivevu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/33677229701.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/20538304471.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/66083735318.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/29506829472.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///18205070035.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/87020700301.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/sakumamojiwakidatenir.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615561be7094e---11178103379.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/86277251135.pdfIn PDF document text
    • http://laserinnsbruck.com/static/23869754181.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/beloluxuduxo.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/19826842281.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/21793081614.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/46267386360.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d5972ac6---93814042881.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16144677e15849---vupobokabugil.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/vukuloput.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1633900596_ea501405c5.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=philosophy+and+goals+of+special+educationPDF 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_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 18688 bytes
SHA-256: 8be2875d33055a9869dbb9c7da4c25f8f3999a0e21b1f89bd32340438b7712d7
font_01_sfnt_off000110d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D0 11012 bytes
SHA-256: 1286813f7b151eebc6c79a99e6b60e47fa594614e5a5ac4a13f85a647ecc462c
font_02_sfnt_off00012a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1