Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccf8593659abf53…

MALICIOUS

PDF

94.7 KB Created: 2021-09-20 14:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c71d11d40420d8b74faedbb8d5cbd5c SHA-1: 473bec162b599a62ddac367c1953c93fb16b9ae0 SHA-256: 4ccf8593659abf538d9c2af801aa29aed9b173a559cf0032235961e11e439966
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, likely intended to trick users into downloading a secondary payload. The presence of a 'download button' heuristic further supports this phishing and download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wagnerpc.com/userfiles/files/kulaxemuzojikuza.pdf In PDF document text
    • https://anctools.com/ckfinder/userfiles/files/xaleweropurawepuguv.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/58040280134.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/44053918377.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/636cb91eda03ae7e7f97360785b01422/12018475587.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/85s513iu1vfcb8ejkep8f1jvke/37718687313.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qmemqqb02pu63okg6nlh53mn62/81358413998.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/4b9760736244bd2884f3ccfbd379358f/kurikiludagaseboguxujideb.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/89500012467.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/93636288261.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/42334659007.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0ac31aa5---lelatinalavena.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/ranuxifezuliba.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/bamifomise.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/nemupozetadituzeditev.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/70741401710.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/62872987446.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/30274116420.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/96337994445.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/nezarozejenurewupenoraso.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/69973509562.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/38208589554.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/75011716511.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/jigotolubutivokujugiwuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lightroom+premium+mod+apk+2020+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off00010292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10292 11148 bytes
SHA-256: 1bce95e865f8a46640958f4a253612a64dde546e9246ac461d90800598714de4
font_03_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 21224 bytes
SHA-256: 24119bcc42a32cab160266c099c861a4a01c01297df5538bbc7dbcd8aaa45a5b
font_04_sfnt_off00015488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15488 16472 bytes
SHA-256: 6aff4dbfac3b4ac7f4d4be7986a5dc61cab8bd4f99e620deae2f891ec1ed758d