Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aca0321766d6cd6…

MALICIOUS

PDF

75.6 KB Created: 2021-09-26 07:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6f8ef693a8315ecf0cc0f42ae5ec7503 SHA-1: 66d2447063af9e81566891ce1483f52c078cbc30 SHA-256: 4aca0321766d6cd68390e14706877936635cdf180e2e2b18aa0db8e2a43b6acb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://irlanc.ru/uplcv?utm_term=horus+heresy+false+gods+pdf PDF link annotation
    • http://mydreamtuscanwedding.com/editor_up/11044061326.pdfIn PDF document text
    • http://delve-cr.com/uploads/jajupasugexapafinijatasob.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beebeeb79a---podigeroka.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/gurerewunijigapaxepi.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/wajubekusewujanagipabitog.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f71227755bca195edf67eadc5d5583b4/bexujifubufomojefitur.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/787cb97d63c1c86848c9c628f2493258/48478764417.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/dekupaxaxare.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/jexobemijiragixupigejolug.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/mezogoguzojap.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/24902713269.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/fidodorefek.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/kogowafapulako.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fabc9a9cd9---luboxivoxuzagikopufujafu.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/99268322685.pdfIn PDF document text
    • http://csp.hu/editor_up/mesilojunusetizunelo.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/meredufejuvepibemawisavan.pdfIn PDF document text
    • http://jamuiboe.com/webroot/upload_media/xobuxovisa.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/guketazewuwul.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/22048892284.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614939d76bc11---wutepumovekeragavab.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/31906881195.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/44623701278.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/38334223246.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/jobosiw.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/99512965429.pdfIn PDF document text
    • 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_off0000bf67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF67 18564 bytes
SHA-256: a099535ff14268745f3f7eb89ca8be0b361a2acb85eb8c4e6ff61a57479dbc86
font_01_sfnt_off0000efde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F5 10688 bytes
SHA-256: c2e11853b6645aa40e6dd758eee4b160f56b12f91d49cbb7dd6e534f90f32b80

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