Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da7feb2243efbb9…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 19:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc9d8cc86f116582020633358bfaea2d SHA-1: 3d400f843982b59df5d426a9685c6fe473ad2166 SHA-256: 6da7feb2243efbb9742550b5da345e2d6d6be4b690b15c3730bd3d3920ecc0ad
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://longarmquiltingacadamy.com/fckeditor/userfiles/file/saruderu.pdf In PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zumovete.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/49352740350.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/29815331956.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142eb2a6a7d4---47042159947.pdfIn PDF document text
    • https://kaparatt.com/images/File/98395074634.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/1532828400.pdfIn PDF document text
    • http://leeandrewdavison.com/download/16100557861.pdfIn PDF document text
    • http://peintures-descours.fr/fichier/files/zulikifidewuw.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/46285206313.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c68c86677---36307915966.pdfIn PDF document text
    • http://exima.kr/userData/board/file/3979690863.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/bodunavexexaxov.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/fesirujaruwakapoloko.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/93462208.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/7284201441.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/lnsh99uaaapdeo341l1veghe31/49491714165.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/xixezorinopipemur.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/82369661125.pdfIn PDF document text
    • http://saint-party.com/media/file/senonokej.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/vatamokurezawovilasimave.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/sesesik.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/susakuwusexakomawevo.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/nerefisejawisibi.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/duxebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=vidmate+versi+lama+video+mp3PDF 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_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 17276 bytes
SHA-256: 2aefbba5aeaf73149cffd6afcadd4f33f3377b98bddc47aea258dcecdcfbc943
font_02_sfnt_off00011b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2C 10656 bytes
SHA-256: 660ac97188e2b51fb77610cadeabaef5017c52d957ac0a39bf44f7477ee35717