Malicious PDF — malware analysis report

Static analysis result for SHA-256 4861d501ff691b5e…

MALICIOUS

PDF

78.1 KB Created: 2021-06-12 09:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 16f9928ea83e40d6870d4f292e110120 SHA-1: ea8d95d5ba8cbd5e9c0011a10f589bf8ba1660fc SHA-256: 4861d501ff691b5ee3ce04b071d4da7bdca7d29f89448769145a1881777e2d9d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The presence of a URL with 'hack pubg mobile uc android' indicates a lure to attract users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=hack+pubg+mobile+uc+android PDF link annotation
    • https://biovuspharma.net/userfiles/files/bevujona.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/71802699086.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/c8932f294f45bd2984ec7dd1d78ecef7/21005252042.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-05-29/images/files/nisotazapozawakaminunugip.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160b602ee6c07c---20513788679.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file/%5C/2021051606442162.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b0b3ebd04---20660952890.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae18c6d12---fusajize.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/75423168019.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/9591a2d6bbffcf01d3fceaf4f79fcdb4/72917630335.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ihjjlib1svtbh9644po9o7vo47/sosutediwuzowodupunoz.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf54eb6b54---tupolomusisal.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/81605920534.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/93e900cbeddf8d2a62c33e4d5dd2c4a7/32023787223.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1r9ufovvtra0ti1v6vie95n6v5/jakeponiwis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 5184 bytes
SHA-256: 81f97b5655821b92348176f8d1babba6612ab3ab96dc8f238722a7cbdf08aafb
font_01_sfnt_off0000f7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BB 11176 bytes
SHA-256: 675c7bf331b706810f7acd3cb0f5f25e5f148dd18a94dfc44b788c16b89dfbd6
font_02_sfnt_off00011dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3