Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a527f2f87739eb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 06:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93474c5d74cca1669933e2b0461b0610 SHA-1: a3f200c1594aa3592b0877f98a8142e57012c18e SHA-256: a4a527f2f87739eb11dedc4a5f5e27a1bd9f523fc87afa311e67c0b7bf0e54ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. While no scripts were directly extracted, the nature of the embedded links and the PDF structure points towards an attempt to redirect users to malicious or spam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://sunwisechem.com/Uploadfiles/files/80624371906.pdf In PDF document text
    • http://szkolka-wiercioch.pl/files/file/71308973768.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/boxegetetufev.pdfIn PDF document text
    • https://wagaskar.com/media/menebeke.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__6119C00EBCB2B.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/nekowupamazefaxiwasut.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/pitexuvosivufop.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/56a1e8a156ae91a43b765e9fdb6d4372/modofikazunafedet.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/muraz.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2fcv2r5hv4b27nqor1irkuf8g3/801784315.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/dofuguzaluwa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a616826db69---16715314349.pdfIn PDF document text
    • http://aps-mes.com/files/file/galifexupopi.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5b6d6f727---kotororasiw.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f7a58f5dd14cf2277214aa1faf9dacfd/10609958271.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7e37ecd1---85426026332.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607063424d819---jomugaresamosekogowolok.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/85ut0tq2fhik5tc66qsvm5jcj4/69994606322.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f883c7c467b7afb4ba1e7083ed3d32fb/wutin.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea96bb300---satawilutelumuxaboge.pdfIn PDF document text
    • http://poiskvod.ru/images/file/jewotadiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=fracasos+exitosos+pdfPDF 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_off0000db80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB80 10540 bytes
SHA-256: e8bb3a2d2eb6763c00210f8c9687473ce30ae56d89d79a7efea8f6abd705e273
font_01_sfnt_off0000f3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AC 20304 bytes
SHA-256: d4cbbac2f38dc68d6cbf89b4cdef192a115b0c70639519a80bf8e444ca7321ed
font_02_sfnt_off00012719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12719 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.