Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48039b98c37cf35…

MALICIOUS

PDF

84.5 KB Created: 2021-09-14 01:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5a0a0d9b65c20d13d9f92f9427a1572 SHA-1: 7ec5f5eced34855284d21dcc9f44111c810db25c SHA-256: a48039b98c37cf35cbe4710c3a0738b439685010e048dff09d5086c2ba0b3e90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing. No scripts were extracted, but the structure and URLs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://k-yoga.org/file_upload/spaw_upload/file/20210905033545.pdf In PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/56119194360.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/78150324726.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613afb62aaf44---25896364269.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/5962380066.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/87144378523.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/24520841058.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/54541335385.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/ruxiwawosu.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/21612247877.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/matojegele.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/puximi.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/82180180499.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/37327330760.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/5550327508.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210904091844.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210914054350.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/digulovotonitigiv.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/wumosubotatukesoti.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/33c87084b672a4531a5631ffefae0b65/fakusunekuzimosunonagowu.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/nowisud.pdfIn PDF document text
    • https://lorus.rs/files/78422471019.pdfIn PDF document text
    • http://regcureguide.com/files/files/39385312046.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/993a2cded56848eb5e46daf36b35951c/zebexuwojunedab.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210903112143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=khal+nayak+full+movie+download+filmywapPDF 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_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 10844 bytes
SHA-256: 7f633b868286b85e49b485d42a9c82a2c24b1ce6028e3c8569eb8753ae8b3d21
font_01_sfnt_off0000fe4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 17664 bytes
SHA-256: a2badb4c28eb71ecb232d982fea795d80444ef3cfc3d2457c6a3935ddf452b6f
font_02_sfnt_off00012bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1