Malicious PDF — malware analysis report

Static analysis result for SHA-256 66984f399958fdce…

MALICIOUS

PDF

123.5 KB Created: 2021-08-11 01:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c899dfec4b39a902fff8c5fcd00c0d19 SHA-1: d3988ad5c9a323081fc95df6558eb925390dcd45 SHA-256: 66984f399958fdce5058f60fbf8c4c5c193417978633d5945054f624ea78fb02
196 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS upload storage, indicating it's designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a LOLBin token sequence in the document text further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://catamma.ru/uplcv?utm_term=what+is+the+operating+principle+of+two+stroke+engine PDF link annotation
    • http://chrislahoda.ca/userfiles/file/97610524722.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/56316160127.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/96910904888.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/40465458554.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gq0lcmdblovjesgss90crfregp/70438126056.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a48f6846f---nidinizapufa.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee366b6f1d---dezelojarupevuxapo.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/jtksre47nj8cqi4h45cg17i3lh/bimut.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc66cac657---gununoxijiribodep.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160797496a5317---pubare.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/32888879691.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/kufawu.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/rusutatitu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fff8c9b529---88035530415.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edf6ca427ea---23302149479.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9baff90636---sawavakiwurajiwelufaroped.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210801060024_2c2kgf.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/derekigogozurexixedujej.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/mufuzonelikazev.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/wisegopoxitonuv.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e1bed89b---31874561565.pdfIn PDF document text
    • http://dges.in/userfiles/file/20473964108.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/29989421787.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/sonaguva.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/59487510048.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/615239144.pdfIn PDF document text
    • https://smarttactic.rIn macro / runtime command snippet
    • 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_off00018055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18055 10928 bytes
SHA-256: b33f27dc4810c0b04fdcf860e14f1def0a78a6d953c623c7be3b1a6dbbafb815
font_01_sfnt_off000199b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1CA 17300 bytes
SHA-256: d5942c969503b2e5d5e780e9c88a80525a91250c3aadef3120eb9a42ec0a9b6d

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