Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa35be2e6119e8aa…

MALICIOUS

PDF

106.2 KB Created: 2021-06-26 21:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: caa6698601bc3b22b68dbad7c44f9ad1 SHA-1: 0a84b35a758f1f83b0543995d1fd2d6bae7060b1 SHA-256: fa35be2e6119e8aa31f0d8e706c9ecc84f644f427f25e2288b225184b22b9083
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, likely intended to direct users to malicious websites for phishing or malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://philabc.ru/uplcv?utm_term=decision+tree+example+problems+and+solutions+pdf PDF link annotation
    • http://uniquestatues.com/clients/9/91/91c6e204ee4529d3b478b0717040545d/File/zuxesizaru.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/01c2cf7feb842902063aeaca957a8265/81940459441.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/adb494f918c74c16a7a3339aa8ca66a8/movubexabi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784a2067ed3---lalazowawusefuge.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/41633048621.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c09p479891nv7tpc1jan4e6v12/73274801988.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabdf5377b---woxogikanisonide.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1e3b0490---46119491286.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/bujurifumavuxuj.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8e0b234d116fe2450583d7c088dd7824/35765016971.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d7d75dc45---70901949021.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6ac4d948---672988710.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7859297a0f---63814507852.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5b740d73b---83730336740.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b95d872d9a137e1117522d4f784ef567/83134842306.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vee8n3b91iah4nigehl9tcvn09/gakijevanepejazuzexog.pdfIn PDF document text
    • http://accronline.com/userfiles/file/kizunodazegiposusogewez.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7e0e8ca6---xaten.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fbed5864dd692030a30ff60534134f30/14952369651.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925b7e5ceb0---57017518840.pdfIn PDF document text
    • http://rideco.hu/upload/file/20861551876.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7af9c851dd2c80320730339f579ed53f/lixava.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72e49a1235f6561477f4e1307f7a4be6/26111424926.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/8db4e14e41f0f96a08d3737c77d431c6/fosumitoxarojetanano.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/00a752a1d2fc913c46fc55251134f2fa/2110971758.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_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 18152 bytes
SHA-256: 674b4c291d60b50309e7555d2977218f273252a05bfd5ab1f5cab90744d7d33a
font_01_sfnt_off0001676a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1676A 11124 bytes
SHA-256: ea771e5d4ef351723b89d7e51f0f1076b98e548b4a01d4fd59e0f27dda5f945b
font_02_sfnt_off0001812f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1812F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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