Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fee6d823933d01…

MALICIOUS

PDF

70.1 KB Created: 2021-08-31 09:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7505a78f92639af3d7569462c643886 SHA-1: 3fd2ea9aa6fe78229ecbd9f5e7c4bf2c14a59196 SHA-256: a1fee6d823933d016310e0bdeddf5c4b605d73c5ab5e6e57823c96812c934e59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a clear intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=frost+mage+pvp+shadowlands PDF link annotation
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/b45b6a7229033fe5a5937bb22d6ad1e7/duwidurafonomovovalo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eae8f746b4---19083960988.pdfIn PDF document text
    • http://bjjiffy.com/upload/lafuxijilezepebokipesaraf.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/mokaruninafarusevozapifom.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098dccf3e04f---rurisalatufe.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/xodubezajakezazorubavoru.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af69a7f212f---4368046498.pdfIn PDF document text
    • http://vieclamketoan365.com/upload/files/46701879486.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/piduwejigived.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/tozunokik.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074584eab97e---vapafeb.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/biride.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210615_5BB927EDA3414099.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/vobixogud.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/sarujomodesovovuxox.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/3d21e71f565e25b3f7b0fc6f9f1d0bc0/43107001908.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/lopire.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/tosoxumafitiwasebevanoge.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/10006098540.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/30757171364.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/94155880001.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/70723797938.pdfIn PDF document text
    • https://tdfstore.it/file/papusezavumememu.pdfIn PDF document text
    • 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_off0000b1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CD 15760 bytes
SHA-256: 677f81bc694d80ea5f26900230b279f4c4a1a85abcb41d4d59ce896c31ae0db0
font_01_sfnt_off0000da66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA66 10876 bytes
SHA-256: f625ff81476031d35d1b4682ff4855294a3ee0f572568edf9900b5ae152a1050
font_02_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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