Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f86c1e9e8af5a1b…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 08:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 69658088bcb479e7a764e80a5f4bc9aa SHA-1: d4a9007c87ddfd61c70823b15cd94f4673395d47 SHA-256: 7f86c1e9e8af5a1b08850516167e8b1136873724f93c125d718224418e068e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of external URI links and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pre-www.bridge-college.com/uploaded/ckeditor/files/fasasew.pdf In PDF document text
    • http://0048.pl/48files/file/86843056619.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-14/de32f437fed158dd68a69f8529d80a7a.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/88634451010.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/93391510648.pdfIn PDF document text
    • http://nova-auto.com/upload/zadatiwi.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/wunuvu.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7c04afan245d3a7mih154vjq04/28061238752.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8f50df92---napozewubewovimazunokug.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/34135335034.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/75422747583.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/34499625892.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/12546896196.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/bamejixapolopudobezaveg.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/susavonujapadiwigero.pdfIn PDF document text
    • http://soc-in.com/data/media/files/zowetavovexizumoti.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/wopikamusafegafoloji.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210908005324.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/zolunikeku.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/37667589642.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149306982d52---30587045298.pdfIn PDF document text
    • https://kaimano.it/file/vogulufutapusuxofok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=system+menu+in+androidPDF 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_off0000aea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA7 16644 bytes
SHA-256: eb2af8837d294965d12a25d5f73565965a27e81a838a3d6245a5c13e3536dc2c
font_01_sfnt_off0000d90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 10652 bytes
SHA-256: aa7447f4a8f1f60ed55435779d27c5b0403937688f0d9605c699a2c4e2df8581