Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ef9d92afc548fe…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 00:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8dbf2fd2294814db2b000dfc24d5e09 SHA-1: 58ab90490a5fa5d465698fa630e02cb4806c8394 SHA-256: d6ef9d92afc548feff0ba319de07ac8524e07b5c9a86160da54a15cb90e075fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://rideco.hu/upload/file/10074896770.pdf In PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d474fe8bfe---tukakew.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ru6flgl4upubj691dirr08f7m2/92820315900.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/vezubapusopodamurixerixap.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/ranidolobomusaliganiguzo.pdfIn PDF document text
    • https://artbynela.com/uploads/file/bakemirusezuvobekukigaw.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/levanelipizapopeximolav.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/016e0117fe1b4fc46dfca4ae08185f9f/rikijofipipavid.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607309929f179---fesanim.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a10705072453966c76f7dfb20a458743/908508768.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/11dbdfd5219a24b19e280d9298c61a87/36769578921.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/kubuwimewikupixizunaxuked.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210701050102446.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/18339454399.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/jofanerixajodarilebadote.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/linubutepuwixejosiwi.pdfIn PDF document text
    • http://fitviewer.biz/files/file/67677293655.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/xutut.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/kodufof.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f3d654eae---tisemulobisafezesora.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/74343861055.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/mutevarudigetod.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073490e485ee---rilimam.pdfIn PDF document text
    • https://abeess.com/userfiles/file/fesojetetodusor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=amazon+fire+tv+4k+manual+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/lavejobalejizopuzuxuxix.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://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_off0000d413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD413 10868 bytes
SHA-256: 2e4bf4e7f4dd0f5c73172ba3e9839add92d60329597d388c62d21935e38c684a
font_01_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 18740 bytes
SHA-256: faefca5ccaa978718ad9939840cd242955d0069c1394a9f7b6542a82bcfb9757
font_02_sfnt_off00011e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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