Malicious PDF — malware analysis report

Static analysis result for SHA-256 f549459342c56265…

MALICIOUS

PDF

82.0 KB Created: 2021-08-14 00:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e21b1771ca9c672a3499ee64e3ed6e05 SHA-1: 0c7455e81b7bd643214dd0d231f84a98ff5ed1d5 SHA-256: f549459342c56265e41ae0b7afe03ba56ca3ba81e91def932ecc626f8da7bf49
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple PDF files hosted on compromised websites, suggesting a phishing or malware distribution campaign. The presence of numerous distinct hosts and the use of compromised CMS upload storage further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d972c4265---6576213327.pdf In PDF document text
    • https://ritascreation.com/userfiles/file/12652035788.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/42745483204.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c95a019b8---tiporojuduj.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d40ca1ae4659c5fe11b88f6f7064a05f/pelukikedonopixuv.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/saxozikud.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210618155741_jpm4rx.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/xawafizo.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/da122c5f845d1c09cbd1321df31ba74a/jibuw.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c952af66---15501087894.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/sudidonibupojo.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610867992fa5b---96993863056.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/nofurawolej.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/16089358619.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/nuwujelitidofun.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ff5d4935---61597126697.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbce709974---gugelorijowexiwugu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/54p0cik9jmtp4di8vmfduj954i/govikikebowa.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/lupilepigogosegu.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/87881587866.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/30253385699.pdfIn PDF document text
    • https://digireg.cn/upload/vunexowomumexugimiseba.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/bagejebonijuxonadedogi.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/56944872569.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79862367954.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16103464064861---vevojegowujugova.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efeedd99c---85746884804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sales+cloud+consultant+certification+quizletPDF 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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 16816 bytes
SHA-256: 855338f37b65c0aeb5d590ca826644f0c91aeb673585cb2652a5b57e3e21a67f
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 10852 bytes
SHA-256: 3230c37a6b6af06a7a4eb722661b99576d96732854212bcd3ef97eab05c34b3f

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