Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fbd55ebaf6694a5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 18:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a1b1e5e3c6df5c88413156eed3109ed SHA-1: ee6721abf76f130c2a4f4db249b3e9a305606673 SHA-256: 5fbd55ebaf6694a5a76d5144f54e7787b4df205d71580c4b48f4509a88d5b85e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are typical of malicious documents attempting to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://allytemp.ru/uplcv?utm_term=bdcast+bangla+live+tv PDF link annotation
    • http://hyundai-baoloc.com/luutru/files/70093226312.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210906025842077793igabct45f294.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/1501018379.pdfIn PDF document text
    • http://anninh247.info/upload/files/nojulovemuguseni.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/sdvcmt3agb6lo2n721gqr0ke73/46091126818.pdfIn PDF document text
    • http://web5gstore.com/Files/files/45676389688.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/vaxinubixawi.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210906170804392.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109120533425788.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f50e182d2830c47aaf8f6d9f29b9a34c/jefavigaju.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/buritexomuwurewev.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/64576461961.pdfIn PDF document text
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/86435356654.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161366d98377ad---dofarojikosapegevedi.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/8185083141.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/19662726555.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/kabigaba.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/1783444688.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/wawenalokun.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/71590230751.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/romuwelixeputim.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/bozisopigatomosuzed.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_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 17704 bytes
SHA-256: 334341eaa7ac0d89816cc4a65e00b19c15f82118b7de673e2daa3b33a2e65165
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 10584 bytes
SHA-256: 2dcdbaa976b6012b17ebd0253b089539ec38c4d74fb73066c9fb18d6dc724e5a