Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7025a3de0223678…

MALICIOUS

PDF

72.0 KB Created: 2021-09-02 23:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 281edaa5711a2b2f08e50fb290735a3d SHA-1: c61979c72f3e71445119731f2622b38cfdaf6481 SHA-256: e7025a3de02236780d6ec9cac6154a3f8fadc639b8fb82f8fb8cbf0a2b8e0f2a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://derfo.info/resimler/files/16801945807.pdf In PDF document text
    • http://locthanhwindow.com/img_duhoc/files/xokijuxibagizi.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/kazixijazunisuzubufixirus.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/pajafutetiziga.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/66599982008.pdfIn PDF document text
    • http://k1a.ru/images/files/file/15445575863.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2c701b69e3f8052ea31f2cd124fbc8d9/ripekududolokanafexe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hltmjijkveqtb15pmhj8veit8v/mupuxe.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/vodifelujabamub.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4c59bf634e8c146ab4eb655adcb092a7/kodapa.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25af0f53e---marodavasa.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/vavibeneduporomotexuxo.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2a1861b9594191bb47200ebcd3b2cdb2/46082189292.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e296572d14---72337740670.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/jusemomijuvujosimakeb.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/f08kg7ndrptia77uhhedtmickg/17841417964.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2e70bd2d0---80120242703.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/fafokuzegikekasosotewevix.pdfIn PDF document text
    • http://spiregene.com/image/files/20210819_050920.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0774db392---kalumuginotixujosaf.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/pupddnkvd4a4pc5a24tcfecjn6/momasatukaso.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/a1829b79a506f64777f59ea61426863e/52685975794.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/eb8edea2d2defce28aa91d56bf2b55e1/gisuji.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/4de86076bac915ed753c61c90695996b/vexupoxezumogimuxixunasux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=what+are+core+values+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_off0000b77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77A 17380 bytes
SHA-256: 755e896bc170bcfb3c721aa0b4a6c91c54eed444f301c064b77f3081c1ba477b
font_01_sfnt_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3E 10680 bytes
SHA-256: 4125107fa6ed262e19b4aecf0a94781c2b92dee3fd57f75a200acacdce7fc104

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