Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89a404c2595e1fd…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 17:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc3eba20918983a58b6d239ec78d4884 SHA-1: 857ef0a113bb85061f477009fd9429542a1b8b8b SHA-256: c89a404c2595e1fd32db0f55439f57b3a7bbff94937bd3dd536ac5340d9453e3
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, with several URLs hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://haphadoor.com/upload/files/93950703310.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sofumubavadamatuje.pdfIn PDF document text
    • https://techlan.pl/files/file/winokakav.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151432248473.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210921101552.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/20864173474.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccd0d92fe---pujubinolowar.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee0e354237---99740872667.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/vadoguxesixikupogis.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/11783714895.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tapal.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/zuwulenibodotujezolojibe.pdfIn PDF document text
    • http://katela.net/userData/board/file/86854237128.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db008134d6---xolozoralumetexetulo.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/15874025739.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/34833896534.pdfIn PDF document text
    • https://italvaping.com/file/87024139887.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/farefedipodadimi.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/86010143451.pdfIn PDF document text
    • http://rooptex.com/uploads/14164386499.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/53621180535.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/tawisokanivalutaborakez.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/34298340343.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=controle+souris+pc+avec+androidPDF link annotation
    • 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_off0000b51e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB51E 16792 bytes
font_01_sfnt_off0000cd35.bin
f11602d225321167f5d379ea9b645c5ab545114548015e5a0e053cd5bcf87ea0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 10704 bytes
font_02_sfnt_off0000e5ef.bin
8130ef6334fb50488a862435ffddc8b3054732f55b43744dbb0e19149613f553
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 19348 bytes