Malicious PDF — malware analysis report

Static analysis result for SHA-256 2434e0df0120bb31…

MALICIOUS

PDF

69.8 KB Created: 2021-09-15 15:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e01798cd53eee7a37618e8030bc05e8 SHA-1: b247348682e0a4d66ad3e16040a71ebf1d6acd30 SHA-256: 2434e0df0120bb317f1285731727f6a949d52d17edeb439823313c01b4e05fa3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://cimkezes.hu/uploads/ckfinder/userfiles/files/44766905008.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ulmgs3uejsig9t4ad8nccdqv0p/76774094057.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/23988183847.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/ginaferelagapu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/semorusibebimuvijag.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/lunuwelisofilugawevowo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1ad25e35---rivijeturezanazerefi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614144097d8ec---pibazigigexetatukojupikav.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/rawusopopunejo.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b38005f0---labugi.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/rakemak.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/93611913686.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2cf3ce377230ae424427b59858dbe77/16927200552.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/42239442157.pdfIn PDF document text
    • http://dakov.hu/_user/file/riperofidinixe.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dawaxitanenadepixaxiw.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/tujodinigamejajosu.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/pigodupovineworosuv.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/39688001481.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/24766870756.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/favepapitebo.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/40771102858.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202109120153183031.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/17888089862.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/27804846114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=real+football+2018+mod+apkPDF 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_off0000b1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FA 10976 bytes
SHA-256: 66283089dd596839d5217340a13919e55dcfa870dabeb895cfa07a3e5b5fa342
font_01_sfnt_off0000cb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 15296 bytes
SHA-256: 5607ab68751b2fa2fc343412a6a3cab22af13fb3e61d96ca9391d0077d2305ba