Malicious PDF — malware analysis report

Static analysis result for SHA-256 684fa77374de8acd…

MALICIOUS

PDF

65.4 KB Created: 2021-06-10 03:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f8103323b5180f4e7ddeefc9de21d44d SHA-1: bb0c09641b2d1fdc88f3f77e7789534751075c18 SHA-256: 684fa77374de8acda969a589db697df18f0251e715f715da9671f452975e5697
154 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9793

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=combine+pdf+pages+to+one+page PDF link annotation
    • https://advantagelic.com/singhania/downloads/file/92944422700.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/rukefulolugulifovovux.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/1i33ibil1osf568lo64a83uhiq/67773796482.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e5fedbf3---rilolesebafoduzopem.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/80710725384.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716abc54583---tosukejiwibuf.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d46e65001---64292840285.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ofo4oenkiacmi75j4kq38mf4ga/nudemofuw.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/da0000d56e5284e4a5926056ac14bf08/dobifodulowiteliki.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160947dd8dba8a---68077400365.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad67e914d---38816934606.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/08b0528ea461029ddf1707cb6a4b30b2/fufikasata.pdfIn PDF document text
    • http://scro.ru/pic/file/16499755093.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/dbd3962a9f18b1b3ca4ea23dafbdb3b1/23119275337.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/28494991525.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3a2vm1qglqfu1gm8dm24c6cd50/jajupemeneliwuj.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e84badd---fipugirivupojegidigav.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/26478427017.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 5184 bytes
SHA-256: f7dacc3bdc237c75b48bde25996040594dc24fe3cd380fa4d79c56ed86f1f354
font_01_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 10544 bytes
SHA-256: 84e29a29ebe46dd70bed0c23ef57ff275b9d23f73372dd80b0d3f706eb9d03f4

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