Malicious PDF — malware analysis report

Static analysis result for SHA-256 5273eed9a1e5633c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 23:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 651828308866c827f2a3d610be81b053 SHA-1: 65cd6ca7ce92e2e5750fbedbe87efc10430d6de1 SHA-256: 5273eed9a1e5633c3a516ad3035fcd0a787d7c22a1acd729e8e2b9b76cf5ddba
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this, pointing to a tactic of using compromised web infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://woori-tour.kr/FileData/ckfinder/files/20210702_FA33650F5492A257.pdf In PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088afc754b77---40663333878.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/bekuwifut.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609428819593a---bidowoxuwebupemisit.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/43363372750.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/6149834556.pdfIn PDF document text
    • http://traviet36.com/upload/files/ligoritopatarozalu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0da9be18e1---20433185208.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/19520547585.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161091a78dac4d---miteremijetarus.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/19b2b0633e18ed6ad76912432959aae5/ropefexodebobumobikad.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007f7c359c---42765674927.pdfIn PDF document text
    • https://kawanmto.net/contents//files/93556836481.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/281450183211.pdfIn PDF document text
    • https://luminex.pl/upload/file/komafiwo.pdfIn PDF document text
    • http://kgmda.com/upload/files/79623114319.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/90158933266.pdfIn PDF document text
    • http://punaide.com/userfiles/files/wimesumivuvunipofetaf.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ek4dtii75rgi1ggl73go59gjb3/zewolavejekemojemuri.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/45532848912.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/reguferorevanibu.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/84547158482.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/duvarunudes.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/pipulum.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/52252157024.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/99398336934.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=critical+theory+of+technology+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_off0000c388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC388 17876 bytes
SHA-256: 10b6e626d23cce4f65b8e34e26c5f0c5e1e179139c8d9cfe2039647dfffc9157
font_01_sfnt_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 10876 bytes
SHA-256: 53177743b473a70718522859aabe304ef0bb33203de0cc9b5230fa259c4d64b3

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