Malicious PDF — malware analysis report

Static analysis result for SHA-256 8264806477fd600f…

MALICIOUS

PDF

71.0 KB Created: 2021-06-30 02:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f9d0a888da9fb9f7d7efa7409e8c11d SHA-1: 5728a6c6294c9648707bec0224e452306fcd599e SHA-256: 8264806477fd600f93757b36340bfbdcc5593942900e5bb70b39feac9c88d9f8
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 CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://axwelindia.com/uploads/63720744812.pdf
    • http://westernmaki.com/uploads/files/71294445462.pdf
    • https://giorgiosantinelli.it/file/bagusoxuf.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebbe40578c---51773633979.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/59fd5ea41c4f945b49b654164513b2a4/26446565873.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b31703467b---69408343154.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0983e795a---tavid.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60f766aac---22804037072.pdf
    • https://cafemocion.com/userfiles/file/91150821474.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/8c292ccdac91588d2b98da0bb1779e6c/ferazozojomodikax.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vrpk3a7r49hc902mromh3om536/80054624677.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16092180bf4044---74608154693.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/6fafd5d33e05556c7e71645e22ec8bf8/wewaxosififosulo.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afef548c72---xujagenebijovag.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/df223f6c13384919a8513184ef1a6d0d/32460627232.pdf
    • http://chono.mn/uploads/userfiles/files/xogoson.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b670a5afc---difafitaxuverufororur.pdf
    • http://massageindex.nl/images/uploads/xeribavelevigulunujovajap.pdf
    • http://lblussana.it/images/file/pisafinorogirexi.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/8197o5qk77jvbfq673e686cusk/wejofawatusajelapulek.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609655238bce5---semikibigapasev.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3b35750b8cdb0c7d937fe9ffaf63a53b/43652758961.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/503d0a20a4086a5227d4a740590a2b5a/82533585684.pdf
    • http://onishi-kyosendo.jp/archive/juwilek.pdf
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/buluxilugewanusujeda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=melt+function+in+r+package
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b79d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB79D 16792 bytes
font_01_sfnt_off0000cfaf.bin
2a7fd2bc8a126e73072663ac699c447513e9848440c2488ba9188408aaec611b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAF 15228 bytes
font_02_sfnt_off0000f62b.bin
8721c6d8c0d41b2fdb10f96592d12ace58830f284a1cc7cf71aad5c6bec1f30a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 10672 bytes

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