Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b255140ff58321…

MALICIOUS

PDF

94.4 KB Created: 2021-09-06 04:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 805f02204bbe307e10df51c411039888 SHA-1: b4abfbca46478a80027f3f5b1f8ea05d1cc68264 SHA-256: 84b255140ff58321846c0530c93ce828aca20d2096b084bdcfe8d91e2fc55cbf
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The presence of link farms and UTM parameters suggests an effort to obscure the final malicious destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=graph+data+structure+java+pdf PDF link annotation
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df0d2df0f24---muvifuxu.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/71932061180.pdfIn PDF document text
    • http://zaiger.ru/img/file/17159766463.pdfIn PDF document text
    • http://candientushinko.com/images/file/patux.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/konamen.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/tijakipudejalaluna.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/20106118718.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/woxetotaxazo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/3fff5c8fc296305d5123ae524b93420e/fenupenizumibik.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/848010d14b3cfdcd9b9595d5f988f015/46173344820.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/nitaguxuvegiwimodituguduf.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/934493bcf9cb963752c2497283f704cf/govuwotowituz.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/58480365583.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8a9382eec---ruzijani.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/81765110216.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/fekosabejig.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9iil5ldo0j8n0nl5pd7h4furg4/gadof.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607af5d0db07e---depesezaj.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dc3968fdc---siwajopiwoz.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/14e08d050f360c76074ee428529d3184/ritivavezaxibewep.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9dbd762b---walazigevad.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/23499543092.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079553f4c725---14561464916.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_off0001031e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B35 10692 bytes
SHA-256: 38621fb13a8f3eb1972158e64f827a81f4ea1e2a1ff1ffed48ea9fc93bee2d17
font_02_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 21856 bytes
SHA-256: 0d78c250e1ae5681443c71fd8fb86f4fdfee64c3ccf9b4b31d4a6947c15ab618

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