Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8fd08eabf838ed…

MALICIOUS

PDF

79.0 KB Created: 2021-07-29 19:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7550fe70f04662c17eaec760a50cbc61 SHA-1: 7639d9dfd53dd31594eaf18b8e8767e4f76f5471 SHA-256: db8fd08eabf838ed821243d956cc59a5a75f363762d660df441a4b9f800425c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and link farm characteristics strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://belovosushi.ru/files/suvapenamutokaxuwivizaw.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a163bc2fb6b---gakokovekerujomisogoj.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/40130507394.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2de974898---ginitasusogadeduzukuz.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/92435986641.pdfIn PDF document text
    • http://insureatkk.com/ckfinder/userfiles/files/69030757889.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0200e36e4---19418979268.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c3514495a---satakekupalunikab.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/41521728923.pdfIn PDF document text
    • http://centrons.com/uploaded/file/122416592060dd8e76a2a95.pdfIn PDF document text
    • http://flexicourse.cz/res/file/83158319019.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/boxusiwega.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/59646869842.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeaaa0dbb---pikunuvamibiwuwunuwa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609098bb98ed5---49228572761.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/79618091878.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a735d211455---92593785120.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9vs3vbjf0tag2pavv9vusrcej7/50036571756.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3cb05a78ac---69343607408.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/10948671072.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/2dc6d99bde6f65d72c61d493a3eaf2d1/58113249175.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/sorit.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/bijov.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/23515875750.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/zulovixinobexipuw.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16080895375ca4---warujob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=landmarks+in+humanities+4th+editionPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/denumuw.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_off0000cee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F7 17248 bytes
SHA-256: b8d010d7d195022d8e6a1c8c209162659795cbac5460fe5085c29dc71eee0991
font_02_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 10692 bytes
SHA-256: 44f34eaa19f5ebec9968ff9af107c0e18ce72cce2c7cb38c3b8725669ecf7a70