Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5e017086280466…

MALICIOUS

PDF

90.7 KB Created: 2021-08-08 15:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0c803eef066c9858331bb89bd306f7e SHA-1: 510c0b19aac63b9766c405ea40d1aa818a661b5a SHA-256: cf5e0170862804666802264c5c1e2378f50c5f8d8dc396019dc212b9d57424b4
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content, fitting the pattern of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/7bf7b77e33e02d25859e598aebe5b19e/belud.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608576fc4e151---21815291340.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/visevidiz.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/a1fi5trljtfsa0l3t29obhjd5s/32986811184.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/7909872759.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af84885d269---zuwefexipelojadazevuwedi.pdfIn PDF document text
    • https://bdcomunicazione.it/file/87053930150.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/58025343779.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/pejifumonasumotuza.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9c36004bf---97227065190.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/87556396468.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a322cf74073127ff1a54aceaca1e2ee5/bovoziz.pdfIn PDF document text
    • https://afayl.com/userfiles/file/49671911002.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ti6p52vglv4gpv92appnbofj57/32463563775.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e0b95676b---96506853506.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/kofatugopopudaw.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074921d0974b---83096526692.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/dodupaluzefegovijete.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/pujekozaza.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/58572962201.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f927164f2c---9319928751.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/67556642138.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503195239164.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/72830592330.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e42d9e85b3f---vabib.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd043d4ad9d---18944996685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=%C3%A9valuation+g%C3%A9om%C3%A9trie+ce2+cerclePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4A 18488 bytes
SHA-256: dceffde7601a3df751283284b051c2e0f2f14f08c15c81ac3aee629b8e715ee9
font_02_sfnt_off000129cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CD 16612 bytes
SHA-256: 563e2f9d2281b3b764ed39c395f0f227ed2c4dd9c711f5cf6f14d9c7bab02538
font_03_sfnt_off000140f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 10844 bytes
SHA-256: a28a8c23d13dc4a27cbb6595c78128edadec5c952e13485d71a0946376ebe0a5

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