Malicious PDF — malware analysis report

Static analysis result for SHA-256 048f4eac8d329ba5…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 14:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4b7cbc045b04824654e481261b7e98da SHA-1: d11118144502e53f110a78b27c97a1eee5ef15a1 SHA-256: 048f4eac8d329ba5fdb0b46b4fb06fa7db171a890167daf18787b56f2b348c49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=sp+flash+tool+tutorial PDF link annotation
    • https://matratva.in/userfiles/file/97446608198.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/wuxaj.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/rijewuvizizusi.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/vobezugamat.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/40057226621.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/nezebuzusifekosofejowudat.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/fufukobonoxufusanep.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/461497759.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tizozuwikafevebogavori.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e0490ee70---32831799682.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/56145547735.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/lumisa.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/42201960689.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7ff1e14d4f19e50eb3156887ba4d1b51/xuwogarukesutifotu.pdfIn PDF document text
    • http://matras-devison.com/upload/file/monipemirezeselotinazus.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/f1019d14bf17ee145672d2289b2de146/28553360140.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/74321215023.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ruwoboweturubegaguvuresup.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/18057930337.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/nefileput.pdfIn PDF document text
    • http://oris-am.com/editor_up/63660428386.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/4176532121.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4ae09116---13568167335.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_off0000cb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB20 17828 bytes
SHA-256: 2c1a556dc6f323ddc8c83e274fdb9ccddbbbaf2fdf4eee3e1010b8d33d618c2d
font_01_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 10396 bytes
SHA-256: cd152b2cc4e14a4d8cae642a7db2ec9d8b710ba45e21c39c42c1567692022fa9
font_02_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1