Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0a3c7294b0b9b3…

MALICIOUS

PDF

106.2 KB Created: 2021-06-29 03:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e9eec08d8703093f05c5513a0964261 SHA-1: fdf20a1a53d6dadd3d0a6aa28dc950af23242b54 SHA-256: 3b0a3c7294b0b9b369c2c52fc3c4778cbe616e66042f722dddf15b9807344950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains numerous links pointing to compromised WordPress uploads and other disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://oniceh.ru/uplcv?utm_term=stage+5+social+contract+and+individual+rights
    • http://ottotech.center/userfiles/file/favikatebamusavovipapo.pdf
    • http://drivescuolaguida.it/userfiles/files/juxuw.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b3e9349013a4718d71176903f8a788e9/2390009198.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/iqq4ljq7tb7oi2jpmi76618gke/10279879096.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e645cdbea53b2afd03852dca622ba2cc/76364201002.pdf
    • https://mimpiindah168.com/contents//files/zesozewotuvekuvonezimi.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/1e3c90e2f4abeefdc669c1967b520d0b/kufirujumesep.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1627e4c098a2586e58709392d7a18add/wotiwu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6epoa9n3m73kqobtg7bhblv5h5/mujiwuriladiro.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b68db245b8c---jedolasawaxajije.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/8151f1072b6cf20ebc5d04da12f5a855/12600751790.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/74535146346.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4597a11fd---jejorakopefewefofavor.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2dd12c1cb11b15f7f9f1a462ce0a68f7/90492943619.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/44391967435.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c389331e---1969980324.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/pl8fp3oavkssrpl4cefc1hu8ms/mejagiduniseti.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087241893742---36283374191.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b967906b9b8---zobekukumup.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/td2148vkkgdimtljf1vf036jfo/68998306120.pdf
    • http://janandpoos.com/clients/872640/File/xupiwonokobazojix.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5eb963d8e---18249437302.pdf
    • http://asiavent.com/UserFiles/file///nupasakokevex.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013af6.bin
92110e78cca656f0c5bb07317164a443cebf19b5f52cfde690a665350c4347a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF6 17952 bytes
font_01_sfnt_off000169fe.bin
2c9b48ed29cb37ad9787bebc7feeafb6e7e388d5de1bd30f7db847ca5e736c0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169FE 11024 bytes
font_02_sfnt_off0001835e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1835E 16792 bytes

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