Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e89187beb5c8146…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 20:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bd27d0a7838d1b2b6932604b23ed64e SHA-1: a59f6e849ae504441a97e1408fe1a8aea6393a4b SHA-256: 2e89187beb5c814669b620328e7b677552d9604e27c20987c5bacbd064aede79
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristic analysis indicates the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting. The embedded URLs, while numerous, are predominantly associated with compromised or potentially malicious sites, suggesting an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4kmodha3q83ci3q6e05pcr7o2/65126827843.pdf In PDF document text
    • http://arcenevents.nl/site/upload/files/tudimipezolaverar.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d9a387ad3fe8b46a71ddb0b8fc8b977d/74655636481.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xumosozedeferamewepibepot.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/82986806328.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b58455d16ba83a7511e1e0a380bade21/gaxifobobuzokewenoter.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/44fe2a2ce7711815aa873488d735d275/zujifaw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5cff355b9003a16e6c893eb1bf2d3392/30147892586.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fed38aced010e5961c8c72997236d208/93875170803.pdfIn PDF document text
    • https://premiersuli.hu/files/files/vijijilewuxemelananuz.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f53387c439e57f24592b0b4cf273ee9f/kawuweraxuvubatavi.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0e7b4d75804036d3414b16a7940fb8c0/20980936395.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/kiparawiximaradadadaw.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/bobufedud.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/khm5l3ae9puvqa7npl95pe1jn7/mexagegurigukupib.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/p84l5hbirqism7u0vslmri9o27/wibus.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b9be03c39---ledizemo.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e4c3c052---raruzaxomifigetomepe.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162735920796263925868.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/3354957729.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/33325210094.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/b2a4d890211f404f20cfa953aedc858f/zimumedaxegusozi.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4jl5utq8se6embad49vqaifbeq/rogemepafumodekuvuki.pdfIn PDF document text
    • https://fototipia.hu/files/files/55890529274.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/xurikojarojevunegenifo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=leche+materna+beneficios+pdfPDF 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_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 10936 bytes
SHA-256: 9706bef488f6732389095201495d080153a62574d78baf8eabf4ff1e73434048
font_02_sfnt_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 18092 bytes
SHA-256: 75e2e6d16ab8f3bd0ce4842a4e44398bc1f3f5099da3b5882196bf8f8b971595