Malicious PDF — malware analysis report

Static analysis result for SHA-256 40efe06a32bdcbed…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 02:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55df37f6b57881915fcfa9f1c8d96d3f SHA-1: 88657a3bd70b3427c588ce98a85f02bedfb5095f SHA-256: 40efe06a32bdcbed34aa68cb556ecc789427def0b2ffc063f9a58508db0d47dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to websites, many of which are hosted on compromised or disposable domains, as indicated by heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and a link farm points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hanlacsclub.com/ckupload/files/69148377682.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/jokononelikusozirogewekes.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///jipixojufuta.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/47219062481.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/66115488548.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161394292c5548---dezukubevipogukezaboz.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/dosibiwegebatozomusini.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/94741380045.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/63988187766.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/97680315241.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/pesunutowi.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f1eb16653---11293947703.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/75628491730.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/daxajumisibub.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210908161639.pdfIn PDF document text
    • https://tepihtrava.rs/files/bowime.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/safivuve.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/biwujigebatuwenodabig.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138d10e97ed3---2377419313.pdfIn PDF document text
    • https://avflash.nl/upload/files/nanowebizixisazo.pdfIn PDF document text
    • http://wirheiraten.de/images/file/33673025849.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/99023278689.pdfIn PDF document text
    • http://etre-belle.su/images/file/5307651518.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/54135223521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=trials+of+apollo+all+books+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_off0000d0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 18000 bytes
SHA-256: e50936aa9a8c466748962f5b0f1e30c9a9c046bcb27c3dda13630615b1d2c7ec
font_02_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 10352 bytes
SHA-256: 726b418812b99307f6d0ab5fb9623780035695e3baf21a33b8d0095aa56b3447

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