Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b95fbec3e39fb0e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 06:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0488140d315287cada09d496d0df1774 SHA-1: 2b12863b49b6ceb30379636dd7cbc4eac9683de8 SHA-256: 9b95fbec3e39fb0e02c7658dda7cc653420089a32fd49a79dc75f70d29f4fc2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and the ML classifier assigned a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The presence of external URIs and the overall structure point towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://filtrydokoparek.pl/img/all/39589419570.pdf
    • http://vipnovini.bg/root/f/uploads/files/morupofebamuludig.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/pogur.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606c659d6d93e---41151980568.pdf
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/73851526419.pdf
    • http://studio5r.com/userfiles/files/30019873458.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/balatijibap.pdf
    • https://samsungklimamodelleri.com/upload/ckfinder/files/tatariko.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6cce2c38f---vuzomelelelizonemuviwuk.pdf
    • http://toptoptraining.ru/img/upload/file/podibamu.pdf
    • http://amexeuro.com/an3_Uploads/file/68353460407.pdf
    • http://jatyn.cn/upfiles/202105/file/1621690213.pdf
    • http://brickchamber.com/ckfinder/userfiles/files/kajonujube.pdf
    • https://travelsafeway.com/userfiles/file/36615232305.pdf
    • https://die-elke.de/cms/elke_page_files/file/jutazujuxaka.pdf
    • https://artgallery.devctn.com/ckfinder/userfiles/files/fapepixakujogenabobi.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f1d38d28---zaxuruti.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/b793t9t8gvuffgol9ijhhr6jp7/62999781373.pdf
    • http://www.polni.si/Images/files/sefunesilijazubu.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1ffc360e---19972174115.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e72bcb4aacfdd28956a9a9b9e0cf0347/saxikasuderezazojaroduva.pdf
    • https://hyundainhapkhau.vn/upload/files/42454187358.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=alberta+statement+of+claim+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1C 16792 bytes
font_01_sfnt_off0000f333.bin
3c14b22c529675f42bb435558e3f704ebe22af8679d029ec5033400c24f1a347
pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 10904 bytes
font_02_sfnt_off00010c31.bin
2569e02f9bd4b4f9f7bc21df5f15aacd9be809a7ff2a180c6582ffdf2853edd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C31 17536 bytes