Malicious PDF — malware analysis report

Static analysis result for SHA-256 52903afbb5e72b6a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 11:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f193083c0251eda47462964cda688be3 SHA-1: 640c26f7d2e52dde4ea67f472009507c9ebcb21e SHA-256: 52903afbb5e72b6ad7f881759d2dc54a5b03d509fd2b685e429f6708aa4f9b2c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to lure users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest a coordinated effort to distribute malicious payloads or conduct phishing attacks.

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 https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a914740a90d---dawefiw.pdf In PDF document text
    • http://toyotacri.com/userfiles/files/jusimipixavusaxikomibaw.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/ffbh4oastrkhmf7nko2lvu9rte/midukebonimobosigudopu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f8d640b1b04a34aa42433b48f52955f6/bimagigixasarelepivinuz.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/kijujerowixitulab.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/19699431543.pdfIn PDF document text
    • https://buyafranchise.org/files/files/nakilotiwezatilobegaz.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/ptg9ekao0s9v01kk6lrplgv70q/kixuxukaturoratixotezog.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160852e4ca2b6b---80140335001.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/vuvos.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ddf85b60e---wuvuvidadi.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/9581102377.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/jutasekovowavu.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/10610631217.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210820095556.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a99e5ce89e7---kigitisexikuvipovukop.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/foliguvesatigoga.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/21c1f56ef1f48a3cea6313fbcfeb9799/67811800201.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/084463ea74469210d49f94f8d95433bd/63442925622.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/mkjoogui58ighd6giesadm0j56/73833844958.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210816125538_NjU1NDc3ODgxMzE=.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/4860603961.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/kizaza.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/gaxamasatugufuxi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609838607c5dd---46802138255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+christian+fiction+novels+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_off0000dee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F8 17304 bytes
SHA-256: 7c320875f424917f24f37e0ca012af9eb7d59fd523a9d8b819c757a67b24d3db
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 10760 bytes
SHA-256: c10bd1476bd8e9baad3dfc9fde39dc4f46a446cfe8587e68a81f4ed48f966887

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