Malicious PDF — malware analysis report

Static analysis result for SHA-256 d466ce165ff98c09…

MALICIOUS

PDF

112.3 KB Created: 2021-07-03 16:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2f053a3bf2034456ff12a9c13bcc536 SHA-1: e7bba03fa6eba105adeb5b5cc7abfd4d11bffc24 SHA-256: d466ce165ff98c0950c8a8fe22c8f13202d21049da6012b760585cde3caad3b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4952a460---47633887863.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa01bd771f---17186800627.pdf
    • http://mywayrtk.info/userfiles/file/71583495381.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1d0282a6---wubukatekenupadusu.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ab1a282b---82356215549.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160830c2ddc1cb---40074932737.pdf
    • http://asbu.net/uploads/FCK_files/file/fanuvizu.pdf
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/lenuvodofojerukej.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/erf05tdfi1dusva9fjucrpujgv/kewoxaremaviwajira.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb9daac51---dejerorukakebuwava.pdf
    • https://getadoc.in/ckfinder/userfiles/files/92438275913.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e866445824---62804159976.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/pbme81gmdfmej6m20pb1u1nq0m/93246089512.pdf
    • http://machinegroup.ru/img/outer/files/28698017178.pdf
    • http://kelvista.lt/images/files/tefajidireruvot.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/85c99f30baeccbb6d960ea8063ee9414/wevubuvigilonewaj.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/b5bf4227f82b145232f0588294f7ddb4/53420412916.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d8ef1e74---48579460175.pdf
    • http://alnoorcity.com/userfiles/file/53682516849.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/41639b13734b3f5b1e7238a1fa081e0e/nesewamenokudi.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/fd4ec9925a75b14dbaf770dc2199e6bb/rebanijazisos.pdf
    • https://shidoremicrosys.com/media/10405407253.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b417570e7b6---pasal.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/acf8dbc15f9c22b519974c067bf950e9/42136527189.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=barron%27s+practice+exercises+for+the+toefl+test+free+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 16792 bytes
font_01_sfnt_off0001449b.bin
a44692eb3d71fd3adb338e8249d0dd37c3f17265889c43407746f80e49d70cfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1449B 17576 bytes
font_02_sfnt_off00015f19.bin
27b92d4ca97e63f177f6dfae98a1a7da2286ad0ae23e792bb2f44e8286c32013
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F19 10992 bytes
font_03_sfnt_off000178b2.bin
702278a779030521a3308a79dc40b8596e7772616e3bfb57e887a6a69353e3d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x178B2 22308 bytes