Malicious PDF — malware analysis report

Static analysis result for SHA-256 b504920cc0793397…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 21:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a93de29862c8a2705dce5463972c8831 SHA-1: a24c35bfa28020069daf0c3a52dcee4c39563ffd SHA-256: b504920cc079339740605cdc01155cb4125834493f7b209b8f307aec31e662a0
172 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://georgekoldun.com/var/upload/file/diguwasodalimuzo.pdf In PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/jusowa.pdfIn PDF document text
    • http://tcihk.com/userfiles/89405037745.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/11112312231.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/18977361135.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a096e3b3230---lesutozobuvikewimi.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/h9n2tjtgtpftl661854ru0bc7g/jediwosinudufunetox.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xifevatawefusoburokuriji.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/22090923599.pdfIn PDF document text
    • http://24cvety.ru/upload/files/6422345211.pdfIn PDF document text
    • http://abworder.com/uploads/files/22655376892.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/9ijbjt4n2i2g6gga6hjiji0482/wisivavasagekawi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e78306cc10d7fc09ff7f6dc594673f7b/76356105560.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/salavolofusivole.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e92f51d66ddcd9d7b48b6e55b4289634/48270447531.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a16f6650d---vumewobukuvafipedowozak.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/85185754266.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/87803278642.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ce9afefec8f3acc43376a6c8380eef91/nakumu.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/xoborapela.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/c2cbc0183e73afc52d6a0a6fe0990255/merew.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/m24ln6lk75vioqq8c2dbhde8g5/luxuxezajiwefezal.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb849c6e22---mapifomipod.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7edna0alost71i97lvt88o4d3o/19492220363.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/69299628011.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/386e67f95b8cc98a945f6b8c2e9726ab/rixipekarodonexaxoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+app+to+learn+quran+for+beginnersPDF link annotation
    • 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_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 10972 bytes
SHA-256: 34054e0b81e1d982a72e10759fd7f644ebd4ceede6eed6e9a4c21268e67e30ad
font_01_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 19584 bytes
SHA-256: 2781fc208cbfdf0d136bd554cf872e5f573e91f927bab996ee66a389f2defb14
font_02_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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