Malicious PDF — malware analysis report

Static analysis result for SHA-256 a369b10316c7b4aa…

MALICIOUS

PDF

90.1 KB Created: 2021-08-08 10:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2438778bb01cf78136ee73f670c98733 SHA-1: 62fba15a2040dbd2e73d781b24d9f109382384c0 SHA-256: a369b10316c7b4aa3d5e83456f156a3083301a88b4b2ad175bec146f487683ce
156 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various download sites, masquerading as free movie downloads. Several heuristics indicate the PDF is part of a link farm strategy, with many distinct hosts and disposable hosting patterns. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute malware or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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.edmcenter.xyz/ckfinder/userfiles/files/81711330406.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/71bd8af53b0b8c6763cad4532bf13be1/63172823916.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/sububotoxuwodimijul.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/8623564861.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wofuwelexipaxata.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084dd7a1d641---76624823072.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/12843259002.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/duxig.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fud0v76j9jsra8fbcloge54d62/paninuvudolefof.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b0379ad1c94e0f30ba46de3061f083d/83098214296.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/23946202366.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/47341102709.pdfIn PDF document text
    • http://skisun.it/userfiles/files/wuxosaruv.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b92411255---vuwegidinogarovi.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210628150232.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/japojedawulajatulow.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e884f7bae10---xizolirifuni.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d64b9e4e99---deboduweronefixag.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/74342379588.pdfIn PDF document text
    • http://nessium.net/userfiles/file/21245966103.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/2a4a5u77dnvnd4ru0qfo374eri/73960494953.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/27672e1bd104e05ab4283027071bf7da/sofovojewabuwixidosafukex.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/jexekorivukeve.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/woxadenususugixinunu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/83633053759.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/ced47a7ee6e513bfe91457a91f863d8c/77266708201.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+download+mujhse+dosti+karoge+full+movie+with+indonesian+subtitlesPDF 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_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 11392 bytes
SHA-256: 7dc6f7567bc78933589d8c990bded4de8081204a0d2ac085e870ba354d1e0975
font_01_sfnt_off000110c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 18672 bytes
SHA-256: 5da70749ed2d1bdd1e174ebd3169c2f6bf0e1abf94040afd46c4e8a27d4f83c0