Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92d22b6966f8f23…

MALICIOUS

PDF

79.5 KB Created: 2021-09-04 14:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 95be37cded0159c1f011578279b1095c SHA-1: 5a54a85c344f85d04d2cb211ec0363f7fdd30d38 SHA-256: d92d22b6966f8f23085f8332a633aee6a59a8f797840faa7c684465e00105bb8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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
  • 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://egokituz.org/files/galeria/files/63375601123.pdf In PDF document text
    • http://maciejabramowicz.pl/upload/files/file/36904433567.pdfIn PDF document text
    • http://recviem.ru/img/upload/redirakidixuw.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202106/file/1624904290.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca3b07b5b---55031013714.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/sabokopitijifikak.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/wubepav.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/31252839767.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbac8e1f4f---40378745747.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/jf1u08ftu3l855gagvo2l83tve/gepulebuxokitomisipa.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3feeeb338---vemutazegiboze.pdfIn PDF document text
    • http://wjcopy.com/upload/files/60525142429.pdfIn PDF document text
    • http://4rrecycle.com/files/file/19248877942.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bce225957---17772387557.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607320040fce8---24959816458.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120372ed53f7---juzedejuwujeg.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/domegajukepawanuk.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/65545756891.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/2115712715.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/42731444593.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/11198179090.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/jisizutanotadukanubemut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=photoshop+7.0+all+tools+notes+pdfPDF 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_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 17444 bytes
SHA-256: 15254b890ea5078f69d79713d8fd3c39c0d4f8233dff04504d5e718d0e8a7455
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10640 bytes
SHA-256: e66e2bd0d003d38d760219e0121aff4be039d16b1b9782894fb6d154c5901a03
font_02_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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