Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af9685bfaf29709…

MALICIOUS

PDF

83.7 KB Created: 2021-09-05 07:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fd83cee8fedd1e31b7cfa4d2290169db SHA-1: 7a57f2f11e46f2e43933f4523d8f32ca81ace4b5 SHA-256: 5af9685bfaf2970955606da043a83ba6358eca90eaa683ca3e0be79d07c56755
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. Heuristics indicate it's a link farm pointing to compromised WordPress upload storage, suggesting it's used to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ji2qlablomsamq6je5bovsqkj0/romorubivitimarivedifodi.pdf In PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/664ddf1f580fdef738b9af234bb0543a/zawezivalali.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/23327916639.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ivno700l2bf0m7vorjff8g8tb7/wezuzijexeko.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/4cd5770c431b4a15ebc14102b5a9ddf7/25667888016.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/95474624249.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/suwemiwopumavas.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/30993659502.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/nolavasofixupaxivazoxus.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/5c7dcc55fd4aca81928d6b681982fa13/jemewewebota.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/96758651624.pdfIn PDF document text
    • https://oversaslogistica.it/file/11526408342.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/2t5noi95k3laik1n6n7kec6386/vovanuret.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/nogaxizobarasina.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/68655381460.pdfIn PDF document text
    • http://nessium.net/userfiles/file/68887454349.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/fewalufa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aead014a766---nutimutatitopiw.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d75950f1e---xokakusolasok.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/suvubawakiwub.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/85319533333.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/78882023014.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/72335476437.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3a59e5fb0c9e089737b507d455220e29/ludijozalaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=uppcs+pre+2018+question+paper+pdf+downloadPDF 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_off0000dfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEB 11452 bytes
SHA-256: da5f965566e967d46ee4d59e07863d068877866c59989145ab7ed040ac8d3f71
font_01_sfnt_off0000fb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0E 17760 bytes
SHA-256: 44ac278b37720ce3a8188cd8c703796f3a08dafe2277b6f4258a47581ae93b64
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.