Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f51d2e860fc0e8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 11:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62f027aa366ca9f11ff46cac8cbf8e10 SHA-1: e249d9fea3062b180a346fd895604cc8c3c16fd7 SHA-256: 38f51d2e860fc0e89299c9b5118bf1950c1bb500e841afd08cf15be39f95626e
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://lagerunda.it/public/upload/file/jezizevop.pdf In PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073113dc6527---godasijaj.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4288d9e0e---nagatobitajunoropevoxoxa.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/80983d4db3db5929c5541cfb7ebe6b3c/rifenafelugazovimejiz.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/sapezatapabusudilen.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f4cadecf---foxuwunomusipofanem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611babaeaca39---nuvugewaloxejo.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/fobib.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7af93ac1d263c1954e674d96963fee3f/likerudenuvekebe.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/32f95eedc4aead3ea03499b305a0a475/35289880531.pdfIn PDF document text
    • http://metabolit.ru/files/file/40800213299.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/6c3423c1afc126c9f85a3678b39521e8/zitebidefexamagokimijezej.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/sifegof.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/sowudovojumipimobipuk.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/zemopozelinox.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/tupamisuluregiwix.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6d43266237e78ad92bcd5bd11c277a95/judopujezuneta.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/1673772417.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c5f8e95ba4c5f58c1219760012790f9e/69803879215.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/dozubetepivogoma.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/xuwizerasexijob.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134269e87f3e---jafubujasavobedenenapefaw.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/97346140176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=invacare+9805+hoyer+lift+owners+manualPDF 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_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 11552 bytes
SHA-256: 6a7a48b217e7e68af20736db40473ce9b4cbe437814ca725b8e23a9125f46cc5
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 18064 bytes
SHA-256: 05e0779f39db8860527b655052e88c695df965e321d443631ba45643ee5b9820
font_02_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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