Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef52583276211de…

MALICIOUS

PDF

81.3 KB Created: 2021-07-13 21:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cdb8d0e12534c8a549e3564826d80eb8 SHA-1: 25715a75fa1d85c5be1fc0706c9b15c27a644336 SHA-256: 0ef52583276211de27372a449511dea338ac0b885d200f2ac23a151544e8b2a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a phishing lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/299c4221470a909a530daaeb169a1c33/52928112926.pdf In PDF document text
    • http://crmloccitanecr.com/campannas/file/25861862571.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/52064844456.pdfIn PDF document text
    • http://minerva-collection.net/files/files/54322713263.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/r21id48q6p1ir9h731ghehomjq/lefoluwawoluwixixibep.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/ximusezigifalipu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/i0n6cfuk1ug1fcs2n8j38v34rb/bivanos.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/sowizepegagidemidora.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a8d944d3877f03ce9e046c2aee5a13a2/katererabizumetosimot.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbef761177---11816893623.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/jamokuwowezisedelowufuk.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/66373727080.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/26bl5haf832rt0go1mad4d1k7j/luzisadazokuse.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/nosegomefabigomipor.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/41278661466.pdfIn PDF document text
    • http://smartarts.bg/userfiles/file/9703732908.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f28c5df4---zejuvisaguvox.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784304376d3---wipamodonavobazo.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/dilojagosakep.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14f6afcba---47294744979.pdfIn PDF document text
    • https://combrooncom.com/contents//files/69000317544.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/xotonesejuxobonu.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff225d7d79---ritawi.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/falafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=two+positive+consecutive+integersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3F1 16700 bytes
SHA-256: bb9b436bc8425a4d4ad1d7553a2bd712a911fde963c7e7bcd1f9a9d9cec1b9c4
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D12 10556 bytes
SHA-256: c775b6e4f98206e281726332431c5624011fc9a5d132205cdaed807bed7040c6