Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a74fb550b3c4c48…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 12:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d7bc7d0bc72d5d1a49d13c9e2967d8c SHA-1: c9f0153b062b5de98d520843002eec1c3e9de13c SHA-256: 5a74fb550b3c4c4825701de6e6b24b1639f900ac78538653303a4d29b1a7ee42
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to leverage SEO or exploit vulnerabilities in CMS platforms to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=scaricare+gratis+curriculum+vitae+formato+pdf PDF link annotation
    • http://ttlh.vn/storage/ckfinder/files/81673235122.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/88160797260.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/f632754af09b0251c4b7a743c1108510/51545280917.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/lanizexikiku.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/farozare.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/c4kff45t4cqnuj4cmmbtiati03/94881402792.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b194b7aaf43---7950150140.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/70824585698.pdfIn PDF document text
    • http://bakoca.hu/files/file/sajuwewizoz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/0gl198qldgl7lml5c8k5qemn7t/xiginibamemugul.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ae950ea3b---63072963171.pdfIn PDF document text
    • https://domilot.com/uploader/files/98918307755.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/16252401618.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216151725306779.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20216201557493069.pdfIn PDF document text
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/72273696692.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/37885723789.pdfIn PDF document text
    • http://cartopack.be/Images/file/97676812597.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0cb7791ba---wiferipubutumof.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef3d93d134---13266536634.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c21bd752b64---55851110856.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d51dd608835d978017c8950da70eec33/bomeboxubegurolupe.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/rujota.pdfIn PDF document text
    • http://slsnn.ru/content/file/zaferudeferolijazavuj.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/pulux.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_off0000e214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 11100 bytes
SHA-256: 611d44d714ac5a4bc34b1334dc0cde16d8acdf0c610de73d8cd73e8bfcdd858b
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 17592 bytes
SHA-256: 0792c86cb5bebac46f6fe147c1d98fd56cf88e4a4a4f7213ed7cee8d27abecf6

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