Malicious PDF — malware analysis report

Static analysis result for SHA-256 403e8a74b3950377…

MALICIOUS

PDF

87.1 KB Created: 2021-08-15 23:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac2a64d492071940d542cda1e8b9419b SHA-1: f1f6410a479919f30510babe9a11a280d07067af SHA-256: 403e8a74b39503771fb4d6422bbc48be8fa3e7680ea9452b7f08c8635c0a346f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs point to a link farm strategy, likely intended to redirect users to phishing sites or download further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=cuales+son+las+bases+puricas+y+pirimidicas+del+adn+y+arn PDF link annotation
    • https://coevent.ru/upload/files/majuxomabawugitufomupe.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/605f5be0f7a26bf12718127cf47bdd97/37967055474.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/xilek.pdfIn PDF document text
    • http://15thstpresbyterian.org/clients/d/d7/d7025cfb1d4df99eee5a588ecc3dd57f/File/mamipamabef.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/zipafurikawabopopisetu.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/negurukunusebuzub.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160737653e8888---nubuduwu.pdfIn PDF document text
    • https://estoniapools.com/contents//files/44677888100.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24279540535.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/54941852140.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a7f1a975---16988275961.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/kokoxokolurapodosut.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ba45c477039e05cb549071d78bfb4446/85381547318.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/33735663382.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/sulajerobi.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/xesibewigori.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/72991875028.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/74375552865.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c5612a509---30663327832.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/86950597149.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85bf41dbc2---78103011748.pdfIn PDF document text
    • https://masihpt2.com/contents//files/kumivajubofulijepebup.pdfIn PDF document text
    • http://gabortech.comadmin/file/pisegiwijagejunaf.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/rilizuka.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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 18508 bytes
SHA-256: 2a39c71b9bf1bd836c78f55eaf1271ddcc9353d8feeef889d0f1e4bb244eac72
font_01_sfnt_off000119b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B8 10964 bytes
SHA-256: 412784d5aaebb9f32242364d74a5b50049aab407b4a65fb1a30a87bf0cd23152
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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