Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a40125fc812521…

MALICIOUS

PDF

78.8 KB Created: 2021-09-06 23:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0555f8051f009192f1cbd352895d9524 SHA-1: ca1717738ea10f94b3761d37cf37d8fa65fc91fa SHA-256: b3a40125fc8125212bb91c54bafef2fa727e884257369a41afe91b4bfa7c3737
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b80b1193---jeletosisoxe.pdf In PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/ziredixumekinexelax.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/woxonafezenaruv.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/46070489393.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/52139050655.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/62887492225.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/25069301911.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/69b3d8d22f00412e5d83ecdf242531f0/xuralanezatajekonejevixaw.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a144eed197---22507755214.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/49775643.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/65049331280.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddb06c677f---91587201830.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/18220441213.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/lirifezazof.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a97815968---mububo.pdfIn PDF document text
    • http://jsjxh.org/filespath/files/20210827165032.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/d020bb80159a9806b08a30c4a23187ab/newomepazijekepivevubuk.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dfdbb79c---70779947392.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/jozorad.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/82233618742.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/71718711906.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lutuzipovaxamijoz.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/wuruwu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/49890115814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=noe+fracture+classification+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_off0000d176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD176 17004 bytes
SHA-256: b3e99279464d6574ba1ddb8bbde97b721d759acfc1f04aae7d40e7698243b430
font_01_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 10688 bytes
SHA-256: 2bed3735b3282c1e56d5942cee92d5106f438c12c91eb7fe8a9a6ccd1e5b771a