Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71c6a473fa91ff9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 09:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65b056682466b2a320aeecd3559caa91 SHA-1: 3722004dfb3c667424d3f8227d4ced8485fae4c9 SHA-256: d71c6a473fa91ff9d4ae294ec8f3349904bb7476463ba7d942a00561e0385519
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress uploads. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://allytemp.ru/uplcv?utm_term=world+top+game+in+india PDF link annotation
    • http://edu-family72.ru/content/images/uploads/file/25144728927.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/7934251245.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202198530525976.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8e3a998a---38185844118.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/14994786409.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/83627790452.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/69654753074.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/turusupoxi.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/puroxuwu.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/fevakopedikalijodepa.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/55594626423.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/getiluka.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/87707587202.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b35223bf7f---xolavopobuluw.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/rumezonoti.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/6594204130.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1de74120476b7b9f9cea10b7f13de16f/27318738929.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b50cc6cb21---welise.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109041148495195.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/80969812948.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021090301493773499.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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 17592 bytes
SHA-256: 17f162fe6e50e47291053abb2352fe421932b0723ddac3710cf2af20d475b2e4
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 10560 bytes
SHA-256: 2f6bce8d983dfcd7568ec6e84fbcb460a5a21f1dfddfabaa2297bd67e2c63dfd