Malicious PDF — malware analysis report

Static analysis result for SHA-256 1078a6582314e5a6…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 14:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 89200d869c2070636ba8c59ead4b7b37 SHA-1: 2ef1fd581101cd722230e5eef25ccc3d48b17e5b SHA-256: 1078a6582314e5a6d023fbbd1987936b0fc0ae44daefc0b0fc54854d44094d6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised or disposable hosting sites, which likely serve as redirects to malicious content. The presence of a link farm and the ML detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/xijixegitujekob.pdf In PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/fetizadatekomor.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210802205138906089.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffc07436a---dekuf.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/39892292011.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/10217721371.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/62662838757.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/nunotota.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/59934089296.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/fubuva.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/17889865094.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77523549319.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/kexiponetepulujuwumet.pdfIn PDF document text
    • http://birdwatching.sk/media/file/14604933397.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/buvizowozix.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/46136243427.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83f8a67eba---litutosomovo.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/68309772388.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/69609942017.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f58619319175697ccf327945fae0c498/tibonilibomezig.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/lokebidinimuritezopol.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/92126353978.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/68238641020.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/96734504467.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/gadel.pdfIn PDF document text
    • http://matras-devison.com/upload/file/todizuja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=livro+after+5+pdf+onlinePDF 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_off0000fc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 19020 bytes
SHA-256: 04772e9836b59c197e7651c3b406aa25fd74018a8b8676677d2f0d7abe9849e8
font_02_sfnt_off00014651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14651 10480 bytes
SHA-256: 45bb9f180f89830abcdda19505a38b9fd670a1e921d64f17ccffac15b55c9862