Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b086f341249cc7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 11:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1fcfa5be89b69942eaffa421912fbb31 SHA-1: e6f34b0717b8345665d17870b212e6626cbd9075 SHA-256: 34b086f341249cc74e32413f2b8096166fb74629b0d45672a16287ef78acd05a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=fnaf+4+mobile+free PDF link annotation
    • http://motovelo-nmsk.ru/userfiles/file/57190821717.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/92074840557.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/sadasafefufutojisafinibov.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/94179709242.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca9d2f3c2---wobivarowu.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/14435804778.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/62032217514.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/gudax.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/93770091180.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/70110281175.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/c869bfd2282f58b6b00a9ea5230aad91/66963405933.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/kifubofumadegajej.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/92125600529.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/22585201690.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/96413055262.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/11249552059.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/90023472762.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210908203729.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330c51753c1---95783749177.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/zigusav.pdfIn PDF document text
    • https://pepsima.biz/files/file/sitawowupiziz.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/defazepod.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b17baeb2---kenesoxotalujazipuza.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109151810342336.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_off0000d1d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D7 10304 bytes
SHA-256: 81106e25ce365be3deda210c47b698ba08bb411bffc046dcb1bd24f67f461e65
font_01_sfnt_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 21336 bytes
SHA-256: 289c450937917311aeef2df9f945602238913a84d3f0b42144b6c40f021064e0
font_02_sfnt_off000120de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1