Malicious PDF — malware analysis report

Static analysis result for SHA-256 36459c4da71d44b5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 01:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf8d45aded44acd27156de32b4f36e21 SHA-1: 7fe7d79a5d20a66952d52b1168b31d2af039a067 SHA-256: 36459c4da71d44b574d588f2bc78243cd7cc72f9b1fab67a066da15e704edbb9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://study-abroad-travel.com/ckfinder/userfiles/file/tuxufirogenego.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f0aed6ff0---49948419480.pdfIn PDF document text
    • http://absigorta.come/file/82318979282.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090605055322.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/93971910740.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724f72080d0---zaxejarimukakatirizi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/mq1hrgdqes01f9a3hpc9kv31g0/dikatagitebujusogekisi.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/61388811020.pdfIn PDF document text
    • https://moolans.com/uploads/files/98605318450.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6cf9bb0962fdd65b7ce5c3f10a58b03b/79969060438.pdfIn PDF document text
    • http://hanifeugur.com/image/files/juxininolex.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335a803697---94056017819.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161035361f317e---857431091.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/13379778124.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/vifenatek.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/50367010200.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/29348599899.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/bifowefadukamig.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33205269202.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/74879269640.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/rewuzilenowapevikarali.pdfIn PDF document text
    • http://fruitvita.com/files/files/lunujokageruja.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/21650000921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=2012+ducati+diavel+workshop+manualPDF 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_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 18200 bytes
SHA-256: 7bbaab6a68d0b2daf7059e6307f20ebd705b8e5a1c498327663f755fe13bf0ec
font_01_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 11320 bytes
SHA-256: 246cb8b9bac1be78570233e664dfbbb86d442be0881c457598ba6bcfb8a8837e
font_02_sfnt_off00012786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1