Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdb7c4517b696b58…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 02:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6639e58abef7ea259b07436fe6b1d336 SHA-1: ab0e0a98a2ad8fa3f9d0b98f9f537c7d7f64bb1f SHA-256: fdb7c4517b696b5846754aa80b07c7a89c528b603de01031681e8de7231ed1be
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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://esenkardeslerinsaat.com/resimlerfiles/40148630708.pdf In PDF document text
    • https://dukumanis.com/contents/files/22070267127.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/dodexodisapoge.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/nikagebesoxu.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/34852595141.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/kugurubujanefexolaguju.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210917_31CDD9E367CA51A0.pdfIn PDF document text
    • http://askort.pl/Upload/file/ritizitoremanajirudapuxi.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/73680247422.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/bokuboselidiretux.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/kafekuxilisibuxidepoxo.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210925054253.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613471ccd6f3c---43853269434.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/vanofawuji.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eafc326a3d---wunerapowuxuvojowovafojak.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/28449658974.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5cee85a5d---bujivumijamefikomulokavu.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/13183232525.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091907382547.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161300010b02a8---tosemugosazivuxagumuf.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161427ccbde461---bekijakisupejewa.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16141c6e741804---gidijulox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=battery+life+checker+androidPDF 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_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 10664 bytes
SHA-256: de7aa9dc5b54b49c13f9c6c21a23f8196c57ac24cf963bd51bc7744ee5f35d7a
font_01_sfnt_off0000c9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BB 17492 bytes
SHA-256: 40c89970a6f260a7e2d99480f94cb2ef08be721eb2747af3586cfa8bb7d06cdc
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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