Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc36f5f791d73468…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 18:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 72aeda06d62ac7ac867f2445ad844fde SHA-1: f82ffa0f1288aa5b1d9455b37e677996a0bf368f SHA-256: bc36f5f791d7346885d4e5f4ebb05974a17ddcb2927906497fd38eae0da33474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://beveragesgs.com/userfiles/file/fukojem.pdf In PDF document text
    • http://inncredel.com/uploads/34849406942.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/23911893905.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jumulebenukiwir.pdfIn PDF document text
    • https://seikico.net/img-tym/files/15356418250.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789d6460a24---98833133226.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/89063875608.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/34824308132.pdfIn PDF document text
    • https://andhimazhai.com/images/files/dupedoxo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/970f263f47bac3bf72ba1304693cee70/4530584135.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/riwudemakipejavabaw.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/kabikikalegozibunijudezi.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/guzetefez.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/waganofogexabogo.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/d06705ed49aeaf5a1f734ac7efce3484/15448414939.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuluxojiximosiwev.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210618012117.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/13622234023.pdfIn PDF document text
    • https://avenue102.com/uploads/file/60483573694.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/tavufumus.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8fac4dd3---74456313909.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/34760972781.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09cf71e592---nazakemadiruvapoxipebato.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607debf15585c---nelexinagajonuruditokip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=operette+morali+pdf+einaudiPDF link annotation
    • 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_off0000d851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10616 bytes
SHA-256: 291dda110433409d1ae4a46e3e2ce140a94f0b9e6286ed0e3ac56862eb41382e
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 20876 bytes
SHA-256: 43326371d50aafc455b179589543d194792ca86b87373f4fe3fd567511678237

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