Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbcc7055165001b…

MALICIOUS

PDF

118.3 KB Created: 2021-08-08 17:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0c362120a00f6392ecd388de544f519 SHA-1: 4ac3e03f75c99dca04fa9aa6458ec725aeb403ff SHA-256: 2cbcc7055165001ba8513db4d3c469449fb6291405885bb28fa2e7b63ae75c99
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://smidgel.ru/uplcv?utm_term=warhammer+40k+rules+free+pdf PDF link annotation
    • https://braindevelopmentmaps.org/userfiles/files/forematulopofadukezuxa.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/bamiteve.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7bd7044b4533535ec745268c4dac32f9/70532130787.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/zizikowopowubuzefefilo.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/4242021405.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c767c3af---88717186810.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9c59b4ca8---rubosuwi.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/xujalajexodof.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a266ec7d5bf---birugotewaxinoporalo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a052531fb47---7350255728.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/88519424389.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/18832344920.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/25746964956.pdfIn PDF document text
    • https://groupunsur2.com/contents//files/turiveripotifam.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ce244e50e---zawizoxelafudurot.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/toferotiz.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d019e0de5a4---27958451077.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/tijewejujoxose.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/68429406718.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ei49e68a2r4kpde6ghjaj7gstb/89012784933.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/r8vkpv7m1evgvdh5bs6j456jdb/kinivevaxajemejuxojite.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/72970485590.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0db9df596ab25acd2c1356341c0ec03b/mofezulote.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/60c6bhrg3npnv9pdcrbj0vlvc3/buvew.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_off00016f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F2C 16756 bytes
SHA-256: 2b048e03690c7e8bc5bb0906a729c13a7437d5d95cc4eb1f3815d4fde82a9a7e
font_01_sfnt_off00019aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AAD 10732 bytes
SHA-256: e63891fb0de2901247f7fba95940f4078f31e81c5b984f8ccacae080e3f7b489
font_02_sfnt_off0001b363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1