Malicious PDF — malware analysis report

Static analysis result for SHA-256 7302d3b4c2d397c7…

MALICIOUS

PDF

77.2 KB Created: 2021-09-06 00:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6292f52a64c54ff9521293d9190dc256 SHA-1: 54dde9f4c0618f1c4360bafea001025aae0ff505 SHA-256: 7302d3b4c2d397c7358b459df1e6354e78863f6e5b34b05cb76a3e9e5ba944fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via 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://ketchas.ru/uplcv?utm_term=company+law+b.com+2nd+year+book+pdf PDF link annotation
    • http://kmjmt.com/news/upload/file/2108212151491294660aeblb.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///nejebutegero.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/lamedegituvapaxokudav.pdfIn PDF document text
    • http://houselandia.ru/files/vasuwawijuxawamewogo.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/83463143299.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/wonogelidipogu.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/jodoremevumojul.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/4407401067.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aaeb2c908---45648322411.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782bc8be4a4---fulamerozifumizagesexuz.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/44605138666.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1cdfacc7b---18296158265.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5ba0c0eb775204311130a5bb9f20fe41/68300566042.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/61331294001.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/zekizuvedapo.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/fedazo.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/rejelerotigedobuz.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/28183147513.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/0b8b687021f018b784dee84fde147557/xalikire.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba259858cb---69952739433.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/31576782305.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/73820305079.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/62041223407.pdfIn PDF document text
    • https://call-life.com/ckfinder/userfiles/files/binarufitagewekibakuwepo.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_off0000ca7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7F 16512 bytes
SHA-256: 8ee7af691e5009e02a3d9df05a959020f7fff48d6c9917077a2e7c6e2f17d739
font_01_sfnt_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 11072 bytes
SHA-256: 152087bad991581fe2336f16f3aef38c151751b63384ad68bc13bec41d0d1598
font_02_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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