Malicious PDF — malware analysis report

Static analysis result for SHA-256 33d8a3338664211b…

MALICIOUS

PDF

91.9 KB Created: 2021-08-14 08:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0e18f409eedfcf74d2b3244665d3ea8a SHA-1: 0511ea78c35167d228bb668198c5861570a7b60a SHA-256: 33d8a3338664211babb9cf0ec5020b0692ca83aa3af8c50bd4be8ea9ec237730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/35706d65972b2a39e72801f25120f385/15566856097.pdf In PDF document text
    • http://ankaser.com/userfiles/file/putun.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61dd340487---tanabararuzegatilizozamif.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/nulutunafinel.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8639353545.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/egb2s7mbpfab5t7iqdhppm4bjm/dalikizapesegafibekowipi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077d32837646---23551701635.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/jewem.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16076f951eac5a---vifowudadodujuvidere.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/jozukopal.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/62875395071.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2df7b8e6f---72437551180.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/peretuzokekafotutikafuram.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdfc448ddd---kokokuxijumogesobapefiso.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/jakidixegomoxud.pdfIn PDF document text
    • https://luminex.pl/upload/file/wozizigemovufonaxetetila.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/74730133456.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7gmkbt5qj1otv2qrpq8l6aoc1v/vixijodetalevagojusulib.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c8cd348049320e96c60266fb447a0b8a/burupi.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107011648223400.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/96717982909.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/r1uu7gphk82h34e7nblm00lnqa/migomezefavujep.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/lazevifedakoberusifu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b83000d13---35686276762.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d31a9902728---29788067897.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/634feec6e6dda96bcdaf4375432553fd/nobofetimosimiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=essay+on+advantages+and+disadvantages+of+mobile+phone+in+urduPDF 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_off000100db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F2 11348 bytes
SHA-256: 180b376a81a437984fc3f78fdd574383f7174177f0e9e07df0bb07f891f4ee4f
font_02_sfnt_off00013309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13309 17404 bytes
SHA-256: 0d4e4191c2d20c82f6c52da70eda8332be50635f30a4d9a08cd3c64ac039feb3

Open this report in the interactive analyzer, or submit your own file for analysis.