Malicious PDF — malware analysis report

Static analysis result for SHA-256 46fce349b0acf6b6…

MALICIOUS

PDF

112.5 KB Created: 2021-09-03 00:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3f833b61a6403a53223a43466d95b81b SHA-1: 810616452defaef5bb6b72d7bc430af3c8b10398 SHA-256: 46fce349b0acf6b65a6259b72765fa4aef1a8a96a08d8d0e230cd1c469931736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, likely to distribute phishing or malware content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=la+nationalisation+du+canal+de+suez+pdf PDF link annotation
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/pclvgl5at1aq5srtkpur0o74bl/pisujedavigiw.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/pulutodotufowelasuxiju.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd66f40c4c8---lanegekejevat.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/77630538053.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92578e66a2---27033676008.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/a03iv8kftbd0i07mba59n8l2j5/15914831801.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/bomobivosizukevewimewari.pdfIn PDF document text
    • http://espwireless.net/uploads/file/69478645273.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/6396931264.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/javuwagitigege.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/meredodus.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/runodewixipugax.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/7297219211.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/fotakiwa.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610364201e0a7---gufaxorovetaxawadugej.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae458e9c4b---13097101783.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/pifigavotujitino.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/3110582687.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/dexisilazetanuso.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080e084b55c1---337489247.pdfIn PDF document text
    • http://abworder.com/uploads/files/90702178082.pdfIn PDF document text
    • https://etadelloro.it/images/file/nugetivop.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/96624946011.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_off000149a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A1 10628 bytes
SHA-256: 8ae00fdaa9b8ac8d6f6c8e8de0d57f78d4b1845615edd9bed62dfeaa4f950cfb
font_01_sfnt_off00016221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A33 22340 bytes
SHA-256: a843683e7b9c6e557f30c63a5a4abb3da702bdbbed11ebe991e26d9e3d050bd7

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