Malicious PDF — malware analysis report

Static analysis result for SHA-256 90081f2a7bfb3748…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 03:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f434debd62039dc86f790c1e4267add4 SHA-1: d5805fe5416998c031de1be2019a5fa71e986d5d SHA-256: 90081f2a7bfb3748336177d9d58ad871ef9e6157e481a84424b1e1cc32ffae4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=panasonic+pabx+installation+pdf PDF link annotation
    • https://associazionebriciole.it/public/file/malisu.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/negakusur.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/vetoferonokuvinonodujox.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/lemisavuva.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/43022731343.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/e24dbd106fd757878c6ac616b78a47d4/26989440932.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f90b708e---zusab.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d954da5e9c---gejefumowadabirokiza.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/ff3345490f0024e8e8a41e20e393bc3e/85441141051.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/wumizodisija.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/33733861690.pdfIn PDF document text
    • http://totoumi.jp/upload/file/nupusikuzasifujepaxiwuwi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072e13082fd2---zujolevekawarijijo.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071412590487.pdfIn PDF document text
    • http://santaclara.com/wysiwygfiles/file/dexarupujukupidezofamen.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e800084ba8---vemadepelogexulagazafagat.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d369bba0d2---66745844194.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/rotep.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/3e7fbe97c2f4386812745a98761b4fe3/foxenibekuxojuje.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/vugitizabuzilamumag.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f8eb9b971942a20f2a37b12088fffbd7/gatejejinoripesi.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_off0000b4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D3 17012 bytes
SHA-256: 3ee5ca83d4a89257f20f34886bc445ed2e2972e744f68071fa5034ce82a024d1
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 10624 bytes
SHA-256: 7156c4564f3a363530492eb7e65b01616f1799f30a6b8a2532e0bbc7d859fd0c
font_02_sfnt_off0000f8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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