Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5817b892118d12c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-07 07:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81502bfee38a3a6ec22b8d3f6f098c3f SHA-1: d053661938dddd673faa5e0af6aa7cfa2acaab49 SHA-256: f5817b892118d12c2ad56db57bdaa0ecbb3e973010ed84d125473afabfe34a78
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO manipulation tactic to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=ergonomics+ebook+pdf PDF link annotation
    • http://brezov-gaj.si/uporabnik/file/zawofurajukodux.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106fed852f79---sanidazutujorupulibuj.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/susululovig.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/18538232267.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098eeae6b6b2---pazarapal.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tasenotoge.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2b3e1404---9581295057.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/nixaf.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/nafojisibuvumigagix.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26de42c500---15302989183.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/nuzatixiguwexufezukifaru.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106249de9e1e---kuremap.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/94584076773.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/13071569940.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160781c69e4e68---konagubidisuka.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/gututusogawipenuvava.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085f611af004---95326347303.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/62900307939.pdfIn PDF document text
    • http://prestopc.it/upload/file/98164856312.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/48983987950.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aa34fe091cd---falumamuw.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/fibugelof.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/sidulorinoburig.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5a9d404bb50391410ae25d8b22e669e0/nevawimipuvamewax.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_off0000e9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9ED 17484 bytes
SHA-256: 31cea26b9980881957d35d9af3f2e0fd92b1b04a5c64cef2b3f74db27231df54
font_01_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10872 bytes
SHA-256: 0c7adb07cb69cdcdb1e9e8547e21eaabf74295c6d601fb730e1ca69142d7000b
font_02_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.