Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e093444de1afa41…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 12:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ea385db46da54b18183b9386cdb7ad2 SHA-1: caf8d9e0cbe2fa09a0bf6f8bc256a40b272ff5e9 SHA-256: 5e093444de1afa418023e0a891c413fe8be580a40bf953a9ea191d5b10c25a48
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The presence of external URI links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://medvor.ru/uplcv?utm_term=drinking+apple+cider+vinegar+before+bed
    • https://topinsolventa.ro/userfiles/file/narajori.pdf
    • http://cafehinglung.com/uploads/files/tavagex.pdf
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/43840020550.pdf
    • http://dongamold.com/fckeditor/upload_files/file/82540651930.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/v4qs9tsqkf8f02nbljrca08iij/pexif.pdf
    • http://turinhotelcompany.com/userfiles/files/pikamaripidororibawafifup.pdf
    • http://le-nora.com/userfiles/file/vapigow.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2468e646e---31405618233.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140059866db7---78318074251.pdf
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/xuwob.pdf
    • https://behbehaniprojects.com/uploads/files/lawonivinotikiv.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614be595a0bf7---81941657519.pdf
    • http://c-amc.com/upload/files/mokimekejogipoz.pdf
    • https://vinacomvietnam.vn/uploads/news_file/56212847537.pdf
    • http://productinfo.in/konadnew/userfiles/file/33278805964.pdf
    • http://madmojo.com/fckupload/file/70780920458.pdf
    • https://mrdak.cc/uploadfile/files/ribuvoduv.pdf
    • http://steakpluspizza.us/userfiles/file/gokebogijotutu.pdf
    • https://mumegram.com/userfiles/file/41016798309.pdf
    • https://ksi-system.pl/editorfiles/file/4716982245.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/68934038447.pdf
    • http://parikshitconstruction.com/uploads/60530325079.pdf
    • http://hai-bi.com/uploads/files/202109090120536835.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/ditigibiwesinivomosujufiz.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_off0000b353.bin
502bc65d0c2bb511ffc2d9d37e4d7cbfe803e5192d7c5fe207086b0779fd5f94
pdf-font-stream PDF embedded font (sfnt) at offset 0xB353 15372 bytes
font_01_sfnt_off0000da51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 16792 bytes
font_02_sfnt_off0000f268.bin
581dc30706b0162af094ab2b0c89be3be09f115a488bc1aa3c7f6a5b754ce91a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 10828 bytes