Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f508f360af329c4…

MALICIOUS

PDF

88.3 KB Created: 2021-08-12 09:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f41d5b0dc6061f9c5948514bae1351f8 SHA-1: dd206cff0e57090c8de270ae7a692508dcfdb46f SHA-256: 5f508f360af329c4b6ff49420c869fe949fcf47d410b1bedb0ea64f4369aefdf
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, suggesting it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160824a9275093---73873036097.pdf In PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/mijunujomujelosiwagese.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/jugegug.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/sufute.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/gewijat.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9fdc0437447167497e5f3f4b234cc8fa/41562531823.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/botebosofirewofifu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092bdb846bb7---sovusib.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74fd40cde4---tipuvipazubi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e764c71ec---mazitonosagu.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/6477752182.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/baragokeretanenovomaboro.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1611152848b484---2809057633.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/18083254680.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/lizinesowejafob.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7a65c4001---fojipaxarisigu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0dc9b26eac---42119154706.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/rotunisebubaled.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d06cc111d---85483686531.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piwununidirosefo.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/fotowarukanorejigagidoso.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/89702570099.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/742bbe488ff81a8c1fdeb40b40de55a4/33942541592.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/78999748947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=their+eyes+watching+god+shmoopPDF 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_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 11076 bytes
SHA-256: 08892ae50a0c64960166afd5fb5b554b6463b3edb0c50f3530e4a89539ce4d79
font_01_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 16796 bytes
SHA-256: 11f3e2bd74855ca34aa3a6b7bed8db4cfdb6ce85cc488abfce9c26ec36f8d484
font_02_sfnt_off00013a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1