Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f61b6a2d1a5ea75…

MALICIOUS

PDF

86.1 KB Created: 2021-07-29 20:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6806041252fab8fef54bb2391f2a7618 SHA-1: 8846d33997cb9d02d7193b093bca5f5f6b846241 SHA-256: 3f61b6a2d1a5ea75681b9288249b9f7127741f0ffa4c430a5412eff377dc656b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, suggesting an intent to distribute phishing content or further malware. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection or execution of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://coretry.ru/uplcv?utm_term=how+do+you+win+gems+on+cooking+fever PDF link annotation
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/zugolomowikogejasuzefoj.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/vigolazenikoligu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/xekidanedut.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/9c0ae1e162451939006a99935857bc03/13629472798.pdfIn PDF document text
    • http://22743333.com/userfiles/files/sibalabobomeredalan.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/4e34ff2be1cb24a93dd4cde30b4a91af/fidovexug.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/096f3d466ea43881c196cf8401c7f2fe/9689866277.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/enuqs5pmj68oedee8ic2124h74/8742379719.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9d3d41e8a9861fa15a847adcb98b34c8/sujodemosowapekozale.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/44086241351.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16086a58f11942---tegibugodite.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/56448844994.pdfIn PDF document text
    • http://hncastlecable.com/d/files/fowaniximofefe.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953faaf15a5---guzusobupudavojiwevi.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3f7be281---42389415254.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/07913de19f20e7e73a51b6c1ef6603cb/18927115015.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/janiliguvudimaxudi.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/denasufagokigibijekupabud.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c738cc6ecd4c9df93d51162aa2e2053/77621364247.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794222263a2---79295748615.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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10960 bytes
SHA-256: 1a7a198f091aed7aecb64fafe5730fe09e70a3869558fcc7ba5542e334305ac1
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E77 17100 bytes
SHA-256: db631fa7b0550a11b1f627c61c52608b90c504a797f0d8517492daff0059e60d

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