Malicious PDF — malware analysis report

Static analysis result for SHA-256 719cb4f23da2e9af…

MALICIOUS

PDF

84.1 KB Created: 2021-09-03 07:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 323d82bac7585ecb416d0de4e0ea45f1 SHA-1: 0945b4363c2844f72b63d613dca24df255e32cde SHA-256: 719cb4f23da2e9afa640ee76c1488f85d70a5858e1235c6ea7b18746adb74047
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by identifying a link farm on disposable hosting, likely used for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://inwebjor.ru/uplcv?utm_term=canine+parvovirus+treatment+pdf PDF link annotation
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a72263e5---51124590988.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/59056903159.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160965984032f6---sokupaso.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/35505449407.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/fekikazafawurejuzi.pdfIn PDF document text
    • https://nadamasristorante.it/file/kisaraj.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/kepinorukakopupuj.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9bc9f33f5---41000809760.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd0e3d9c1---51566856247.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-13/20210813110228450430.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/68602246054.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/35786662228.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/leruvutalib.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/bezareburubejuzidivelu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7de21h0gb2ee5rngilu7in0sr3/dijotofazosev.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/bulebikeba.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/dipajuzakedimetov.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085989aa76b4---mitevinijusotomaxur.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/39425415712.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0768c53ae---zudowidab.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b46098425ff---79917746578.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fobevefibugojasutirog.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/75745009160.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2n6383eo9nt02egth7b5dn2f03/pawinuzosepelutiv.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/4231d1bea1d635b9ca66483b79e1dd9d/33320251858.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1609b09f886d74---laguxugutit.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98154ca267ccb236bd312f1c7463ed30/luvapo.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA8 10808 bytes
SHA-256: 0c6f782a42dc8f3804610196b73d1cb6e7a7b394c6b2de525b155dc2deba2ac7
font_02_sfnt_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 17488 bytes
SHA-256: b3ec2638a2b5b17f09dd19467893210de7ccf19fc1f9e6333a36eba00be8d67a

Open this report in the interactive analyzer, or submit your own file for analysis.