Malicious PDF — malware analysis report

Static analysis result for SHA-256 5529428b495bb085…

MALICIOUS

PDF

87.7 KB Created: 2021-07-25 17:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1451bf678397e487d7578d80640c0366 SHA-1: f9e3c9bc0a116cb9e69aabcc2593cd420b8bc129 SHA-256: 5529428b495bb0857798fad547fc7d65dbed8b57d08da8c7b90a452cc86d6c20
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67814a8ec---leberexazexegaxijogagomet.pdf In PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/360ba294822ca2035453f569f1bdab8d/kaxedukokezokujefefozom.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/7230989511.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/7013005931.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210612_055447.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/motozotelusi.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/jejodufedifu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//nomovejumexub.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/loluwoworagarusavo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lnc59buouand6h8b0rfspgosq3/domimarisafox.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/wolokupajifu.pdfIn PDF document text
    • https://birotex.rs/images/files/26106336369.pdfIn PDF document text
    • http://webursitet.org/Files/file/fikitawerapusisozuxeka.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/fesena.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/3069741957.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/9272363243.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/xodukip.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/voruxiragexunifinugusa.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f88113a17b---2031953140.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9338fc65903bea6717918a63fb38cb0e/bowazazujojatig.pdfIn PDF document text
    • http://brookhavenclassof1967.com/clients/0/0c/0ca802fc87877f8c548ddf85495caeb2/File/11885316062.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/94601546159.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/xugugefefugidovidazunida.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079146f6c1e7---85618662118.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160757d0b7a9df---42754092777.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/mogiweluzobajerofupib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ghost+recon+wildlands+beginners+guide+redditPDF 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_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 11012 bytes
SHA-256: ad79c7d624832f0bd009cd2ef099b4751ab10ef8c04f3fbc8328550607ef38f8
font_01_sfnt_off00010895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10895 17456 bytes
SHA-256: be97d072e880ea13e0cefd434eeb6a6e96fcf9adf2c02aa4e40493e8c5d06456
font_02_sfnt_off00013603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1