Malicious PDF — malware analysis report

Static analysis result for SHA-256 d846d69c94b856c8…

MALICIOUS

PDF

85.6 KB Created: 2021-09-01 00:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 872e769d3dba04a50782f41518bd11b7 SHA-1: 6f8cec8de23f74109390435943af8bc7aae9dbf8 SHA-256: d846d69c94b856c88ea76dcc21472edb4abe1e590a5e7a1440503f09012b2eb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, suggesting a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://oniceh.ru/uplcv?utm_term=book+7+test+3+listening+answers PDF link annotation
    • http://childconnect.com/swi/fckfiles//file/geniwutavuzanawuzadusuv.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/74f4c9ccd3dbb344a5e171993ba05b64/63761029678.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/75049714003.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ssc2h2fl5v3kld8fgihvbjdpm0/koxivajapoposewexi.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/gefefelivevusetugunavad.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160afe8a9ebdbf---67134265015.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/38989155078.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/6056663043.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hsqf81bl5b8l3dho4u67jbhqp1/9146837979.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/gegavadejelabugu.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210617120551182.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16121a42cdd18c---mumumupupilakal.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/86572867415.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-7/20210707230920745564.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/432be8edf7a74481115dbf4a34f5261b/dedikunimabogikasero.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071d077b0ac9---rajesigewijopajuxebusur.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/18823173299.pdfIn PDF document text
    • http://yuha.be/_files/file/tulisodofopejunaxafekoro.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/marovajezo.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/gomalagipigujawavejeb.pdfIn PDF document text
    • https://ikima.fr/uploads/file/zigepusinujik.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/50976929760.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/18025497397.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/3d0c7cab08d97ac706f7b1beda535487/kumamenovij.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/86694781678.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202108151949138514.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/pewasuvol.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 18652 bytes
SHA-256: e949e57701f6bb8b3ab65388d56544c8dc6a98b00eb3252af288019f8326efbc
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 1932 bytes
SHA-256: 71db3b6fa33e2984175fcddd7cd520f472ffa8647ac4a614519378a109f62243
font_03_sfnt_off00012e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E69 10736 bytes
SHA-256: f61ef1e44bcb0c530951be675aa70107acc1d3c076bc51701d08ab500a9b8500

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