Malicious PDF — malware analysis report

Static analysis result for SHA-256 8619e54060f4beb8…

MALICIOUS

PDF

74.0 KB Created: 2021-09-16 20:57:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ae42efee18385531c903c4e2026414d SHA-1: 808a920561051ea157cccd065b423c9d24f9a72e SHA-256: 8619e54060f4beb8fac2dcedffde1259d0d3da42770d82cf923803133f8084c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised domains or disposable hosting, aiming to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage SEO or compromised sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shriramsteels.in/public/ckfinder/userfiles/files/pepatizaz.pdf In PDF document text
    • http://www.gamylai.vn/uploads/files/fagisaxaxomezaxa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/ratobopovuxa.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/katasijasamalapekumutipo.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/wekupeputupibutu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/94811531121.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/87040091724.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/mosojefesuve.pdfIn PDF document text
    • http://inphilong.com/upload/files/89776166002.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141eb0cdc739---93101867398.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/sujikelelorupupilevisuj.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/9781230778.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/33684874869.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/54462894009.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/71598583847.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c294c377fe---rulifexok.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/rolufuworomakalegibakuk.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/miwupepob.pdfIn PDF document text
    • http://atek-ent.com/upload/file/43787023812.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/851885c1c5a294589500fe5c4b36738e/sutepoli.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gajalevoneri.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9634472640.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/gifab.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9443b197---rimopisemunitajewulen.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/bonelugotuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=simple+past+and+present+tense+exercises+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_off0000bf56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF56 10836 bytes
SHA-256: ed430adf79b0bb7e3030ee679fb3b87698c5ce90bbdc96d77ba55debc8640334
font_01_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 16228 bytes
SHA-256: d80e9a45088cb854f5ae191c8e355646d10828ed3c9e8d1d9e37c433a7be7dbd

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