Malicious PDF — malware analysis report

Static analysis result for SHA-256 879b905377758b7c…

MALICIOUS

PDF

80.3 KB Created: 2021-07-02 08:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2224000500b44e5872e7aa6f84054370 SHA-1: 842ffa27cc05e469a6122f9531dc9ce3ee883175 SHA-256: 879b905377758b7c96fbb55f713ff5e097a80f6e928512f0dfef31064fc5ecdd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The primary attack pattern involves luring users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6997

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://erdemlerkoleji.com/resimler/files/55187793896.pdf In PDF document text
    • http://chupanhnoithat.vn/upload/files/fepunenixogavazemutib.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/62029002409.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba50b1907---25736508027.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/ucebcea6r1qof880r448fe21rb/zusate.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/botitupaka.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/92689568810.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13ca8fdab---13853879084.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/79754190885.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/618762f6f0760ca6521ebe84695c316a/rukifugufegevuk.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v1iloidu08utc9ohflhhmle8k1/6532357646.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/nedurasawamenukugul.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/38rqdnnvdqa863bj4nal0jue23/favejud.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/wumumatabubupibareweru.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9cbce4e96---jikalotowaxoligorovujago.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/kopomowusebididabofo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ca6cf3d4---vixinovuvulufofusiginuwiw.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/bizifefaduxevopu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c990f978---zokoso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f982cc121---37562803642.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d37601e50---33718976273.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b63225b57---judewosutubagiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=software+test+cases+example+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 17076 bytes
SHA-256: 0833c4da37e3ea97192f6608ef4993a74a0355fb48168c23dc8107f081cb5d25

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