Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75889f9882eae74…

MALICIOUS

PDF

73.7 KB Created: 2021-09-16 23:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 822f167b7b7770adc4c848083dd4a8ce SHA-1: 7f91ceef6ac9e38f8076e57f50a442297ea92a76 SHA-256: c75889f9882eae745cf22a67a5f3de6360e9f9a5b642a81eec194b160e25afc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous external PDF files hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://webhosting4.net/media/file/87652105161.pdf In PDF document text
    • https://dialogueinpraxis.net/files/docs/wixuporujaberupuzuxosa.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vudovuli.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202194172295914.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/3720659187.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunevinefaruxuvevepa.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202194165555442.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/milipemad.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/6630978938.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303c9f7b992---59700966767.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/zatigoditerenukipoza.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/jinex.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/dokaruwulebozokikaja.pdfIn PDF document text
    • http://parfumland.sk/upl/wafap.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/15838873121.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/fojilulotesijal.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7c6ad981---87819115628.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/jadipiwesekopawalibele.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/28255030534.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/12294729070.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/nujenetofulenikinot.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebb338e1c---21482969735.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/93092292474.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/14856061561.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/fewum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=minecraft+story+mode+apk+full+game+free+downloadPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/gexojiwukepefexew.pdfIn PDF document text
    • 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_off0000bb45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB45 16580 bytes
SHA-256: 3be2b4316b99e8fc15c644c2c2e583f85f423415a909205aef83061f0dd2845b
font_01_sfnt_off0000e5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C8 11348 bytes
SHA-256: 635fe9ce3a4f76d389eee8a2f0f4837de85da4d272b8a3f0731c9a27ca1e1971
font_02_sfnt_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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