Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfb94b96536e29d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 20:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b72790e9dc17eed6d159e78fd69a4c97 SHA-1: c45dc1b85859cb180a2c5151eda19a2ecdf1bec9 SHA-256: edfb94b96536e29d0e840dc63dba32c16b7583e597d0035dbbef1f49af6ba489
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=gangfort+mod+apk PDF link annotation
    • http://thuduchouse.vn/pics/file/2990829114.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/79753802216.pdfIn PDF document text
    • https://inprovitchile.com/ckfinder/userfiles/files/dotesibivupali.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/jutujineroxe.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/97860908532.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/51204990410.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/dakuf.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/168679128.pdfIn PDF document text
    • http://bluebossa.pl/files/file/62484374499.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210906224006969710xo3ye1.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9fe772a6---34887479310.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/36456648550.pdfIn PDF document text
    • http://innotack.com/userfiles/files/tidunomivovubevajijo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c96ac1ee1---fobake.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/10343039453.pdfIn PDF document text
    • https://totounited.com/contents/files/vitusapomafolemibirajefag.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/lutirasimupuweviri.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/wugukuvinewumalepamel.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/rezesulofedaluzijosem.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/nepefukawerute.pdfIn PDF document text
    • http://ifap.it/images/file/30635640638.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/tesemezumojizimaj.pdfIn PDF document text
    • http://hydrem.ru/images/file/86647473506.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/jidizofovesexesoxuzor.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/16815579757.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343164272a7---lunexoxebozonevug.pdfIn PDF document text
    • 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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 10536 bytes
SHA-256: 789e8988bf94511f0dd8e4a5a3fd610c8a572cccde8954d03a6cb6db655a1d3a
font_01_sfnt_off0000f22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22E 19188 bytes
SHA-256: f4a48dcc5b9bcacdbf6ac0642904575bd2952205a0b1b88a04464868364c82d2
font_02_sfnt_off000124b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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