Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a447b70247735e6…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 03:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5dae42e99eb99497290f7c0dbef67ca5 SHA-1: 5ad5451706ec14b32e10e9e4ead2d58e5db7428b SHA-256: 8a447b70247735e648bff4dc095a1dddf7c187e4699327acb5817731c295bed2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with malware delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://cructi.ru/uplcv?utm_term=video+editor+resume+psd+free+download PDF link annotation
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/85489642990.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/93233802725.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/19717403093.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2940661c088813f39fc27ccd2c2e7881/suwanamefetigolifex.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/99882940675.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/84695106051.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/sufek.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lh1djr3tltnsr5pvp0hm3cvke3/fozamojej.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735acdc113b---71287389804.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/27722482616.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/55172852905.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/ea75bd7bf508435e7396d678b312cb65/85416930861.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8529c03124---83597328509.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1ed36951a---ralifitebomozigogabeze.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c94b484ee6a---79250735011.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0d9b76c0---88968172081.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/j6hrq09tmr7i9v8hhfr4vho8m1/72067773110.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33bef0c47---27971455865.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be287b24fa---vezafaxadupuxexub.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1bfd818cb---nofetasisegepuvutovu.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/623508e3ae680b4e51d064a8cc461dea/29712388970.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d991dca601---gitopudawu.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/38e223ded53f61fb5c086ada44949b09/46962883294.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/hggcud89mtgh1iqs07hv0q1v12/10532567788.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/faguxakejenij.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/laxuladixa.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_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 16420 bytes
SHA-256: 43a5ccc8a7d6008ae35ae92999040e8f0e36652f038cf91b12d900a906bda3bb
font_01_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 10816 bytes
SHA-256: 48ce2894b872060887f9c2a4e0533790529bca09b61d2b333932a5b1240612f6
font_02_sfnt_off00012ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1