Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8db1fc7701183cd…

MALICIOUS

PDF

93.3 KB Created: 2021-09-08 03:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0e779d3708a28c48079c1d4140d4fce2 SHA-1: 2aba19d5bc86b867f1948282fe4663ae2f7b2c99 SHA-256: a8db1fc7701183cdf58d7088f66a5c9cac89b36b462328b18f5f32f6bfa84906
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://knoxvillecentralhs1966.com/clients/8/8c/8c0a3a1fea337096d337135aeb812fb1/File/92872506886.pdf In PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/vesilokakewide.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5a2338643---17982950186.pdfIn PDF document text
    • https://olterus.info/contents//files/faxawelidabudodo.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/bbceacaff5eccbc81f44ad844b931880/diradupobupujofomekiwap.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079542148495---vonikikunepu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/082d6e1bd9cf3b9543e750af33a99624/xebupowewisisazatemolilis.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/18492354062.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bcdd2a096b57dc78167a27cde582a1bd/korosefaposenazuza.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kq645ek99ml2905t430ie0hq03/33253994919.pdfIn PDF document text
    • http://uamarkets.com/images/file/9827938908.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c73ea53b---8090713075.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/vegafezesakapapumorulol.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/ganefavol.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/90450698751.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vbbcb0efk2ka0mr4hn39uoc6j5/wuzugavazawivutifivemi.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5f84db5c2---46472735697.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b4197ce41ae---56706062679.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/4839632.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/99948861113.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/52838458116.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/96504845991.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ccfa8bb53---32955935575.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/3tuq146t63nhdd48kktnncpppe/13372237257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=photoshop+cs6+beginner+tutorials+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_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 17252 bytes
SHA-256: afe75c3306256c3c228426bab4ba50dde913471425fc21a0762f8cc241e1e9d7
font_01_sfnt_off00013514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2B 11308 bytes
SHA-256: f9a916a7dda81c70882681ae84e7f33403b60d4d488b50e4c970926916b71d84