Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6fb07c946f1df8…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 01:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 970214feb9e2a3fda8abd48344a8dafa SHA-1: 29a032a195483a532bef7377b7ac17c294d1aa22 SHA-256: 9f6fb07c946f1df8db88c0479442616e0a255e8eaf5530999094f5191c3d9e08
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to distribute further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad325f6d9---82563267757.pdf In PDF document text
    • https://rowsontw.com/shopadmin/upload/files/54919385934.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/jipujinogewogadovizidab.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/metekikoxewi.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/vuxokabolifitatifad.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/58667818530.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/mefewufepixajigixi.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/nerasubuwonavokuse.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/rogoketetam.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/muvokoli.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/78209538901.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/589beb7757a7393f890ccc5b4f8b3eff/debadoxusuxafipojixilej.pdfIn PDF document text
    • https://supremeroi.com/FCKeditor/file/junebofuzowilatumutijopiw.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/bexokujutetepivajenelafa.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/xozebabewibigumepavela.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/34644849719.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/satowesusiwifixaxegagujog.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/virutuliwobiraxadofoz.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/basubewemojigujeronuzele.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/karugijapirubob.pdfIn PDF document text
    • http://heizler.hu/files/file/13684346960.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614263e5df043---ginoxonuvivulune.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/84169086023.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/mamezipitov.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/bepuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=thop+tv+downPDF 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_off0000b030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC842 14300 bytes
SHA-256: 3a31506f619e0d88cf697926d5c8ff5c01fa7e35597865e83d36853ba3863c86
font_02_sfnt_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 9904 bytes
SHA-256: 2fa74d7f5c88f0bd63487959e962a01cb0af130efdcda4074a4b0c0d4f6130d9