Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca355b03339f1f0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-10 18:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0a93901a68f86c6f236c17ac69cd6617 SHA-1: 16acdfe6eb0a39633463841a85e1256b319ab8a6 SHA-256: 3ca355b03339f1f0a60aeb21c14ef13cf1fcc0a0650b70b833f223ba66b3db90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs lead to various unknown domains, some of which are hosted on compromised CMS platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94b42224c---xefavivegenubu.pdf In PDF document text
    • http://nousgarage.com/userfiles/file/xezosebuvijuvebo.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/rijudusabadoxatujapalu.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210902_BE29725C4C13B930.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b15ccb8b5---fepubumiwede.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xosasu.pdfIn PDF document text
    • http://kelt.pl/userfiles/file/fovovelebefam.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/xabof.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/10630395894.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/73859626342.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/92829939209.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/jokosufopetev.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/56063596508.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/90109781503.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/14798515081.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cba4d53e9---polurosezurisevejupuvaza.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/puselobufakutafotapuda.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/tojawifezuxikulogaboduxe.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/bedidifipakekekasa.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/64341630660.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/47130539823.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/96371093715.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16139ea7cbb406---89411684101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+makes+green+dye+in+minecraftPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 18012 bytes
SHA-256: 013386a634cd07a3ba21d59691e05bfb8089fec17e3fa7659afacec4afb0544e
font_02_sfnt_off00012234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12234 10956 bytes
SHA-256: 065decd4a0362253c179d25d1230ce302138f2ea3df699d5e67565801469d218

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