Malicious PDF — malware analysis report

Static analysis result for SHA-256 870e39a3d8b9119f…

MALICIOUS

PDF

90.9 KB Created: 2021-07-30 22:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b8fef15248a9ff4638f2d4ba75c95a5d SHA-1: be79a44807258c98dde5e226829181b5d984757e SHA-256: 870e39a3d8b9119f36ee85372ab9df7ff9197239e50c8282a474b970e96e435e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 https://laborke.ru/uplcv?utm_term=cambridge+checkpoint+science+workbook+8+answer+key PDF link annotation
    • http://com123.vn/uploads/file/vutebaxulanereresoxutod.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe3318368c---sigib.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa9603c05---zubitolafitezujaze.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/soziponebuloki.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/25/96081878848.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4da4qbg7r3anort2s0sgo3rid2/30951740743.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c018e7a90b9---gujexizizuzeri.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/wewikumoj.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/pimalurifuwizipuse.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4a9adc2aca370893c2eff2a1b494e01b/43774331605.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/8a56327187f00e7882a06546473a11c0/buweb.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c10473b2168---vadiva.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/tptr287fcanedia3v7d9oosqt2/87066991598.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb07c7cca8---5811819421.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/vizevarowes.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a321e7cc71---bawisuliraxubifumuduli.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b55025a81---tedavevudapinebawef.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecd39797265---pigivivomurenuropil.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/60672765090.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/88399979245.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/poxojutijixizisuze.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/jatetobu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091583bc0006---badunigopuvajakukepirib.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f579c3d5a9---newapuzojatovagisusu.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/lipivigefogoretora.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/begevimo.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_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 16204 bytes
SHA-256: 9f83df8e6d72909311b6dd56078c13dabb829d089a35e7f02ec39a8fb9824221
font_01_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 11588 bytes
SHA-256: 63d0e4f87eb20f2632c077e3f7ba595159e3684fef4d047851542b3080796553
font_02_sfnt_off00014489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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