Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be82855b43ac293…

MALICIOUS

PDF

91.7 KB Created: 2021-07-04 02:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76c974bc2f2a5014665be5bd219562a3 SHA-1: 04ac1f5a8f0c4d03e48376f92c0c1b13237bb0d9 SHA-256: 3be82855b43ac293d84fe434e68378a3282fff031ddd9b2742a2936701e72a58
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://defrokatilai.lt/images/files/zixobeduluduzimamamuvop.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cf861988abc---rajudajurazasogomujesuwi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7c16985ea4953e33f0ddfb87d3a4c78f/kupaxubanumeperalurusis.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf7e6784c---xipuruzez.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/15lfq49eo04tl2osa9k2lj2j5k/96932313439.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/pefarilapitatipikuwexinus.pdfIn PDF document text
    • http://bakoca.hu/files/file/76003026032.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f7clhqku3sk4kfqrm7kbkeo490/gawuduzekuka.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/49f62c7b320e461ebaf68af77e767d49/lugazugisebekekuxufebife.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/62116887409.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/41317021013.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/15365138334.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/namakararagikopaxoki.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/90167856763.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nomedazididikidubir.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/qi02ojmrnfj23dl8vgr9lr3ha0/fazisavatetal.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857da899dd6---35360339775.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/43098680839.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/e2c97ffc97b38b558d2bd6e3f0d004d0/sikujusuzisirupuw.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0000b7cb65ea5c584ad0307cf0358e6a/13928626644.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/34a763cdbee6701d369b0ae2a3416053/sigataduzo.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/0aae333cb3e18fa3362ef5ab7b11e8a1/550925106.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac5c3b4e76---42504838238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=phonological+devices+used+in+poetryPDF 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_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 19084 bytes
SHA-256: d0d11335fd004222cb3b05136f7bcc234bc727b2e4aae4b642334da9aaacaf34
font_01_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001481f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481F 11076 bytes
SHA-256: eee93209a4d1cf66559794898273b2e825375a26cdcbfdb73946deb59579c6ad