Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b81a906ffb15aa7…

MALICIOUS

PDF

72.1 KB Created: 2021-09-07 21:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23f274f00d8285331049aa086a83ed87 SHA-1: e9c9d8aeca42d5bc56ce20604e3ea27179df1c7c SHA-256: 9b81a906ffb15aa7dc7b59704210a10419e468745c8d5d9b3a6bce3dac4e2bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or appear to be part of a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links and the phishing/trojan detection suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/mesesexedozaj.pdf In PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e35f69c6eb861ce0e5759598250600eb/wakol.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/zibogizaponapubileja.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/zimilowegezosasuwulem.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/26fd3173a1d22f1c109041a497687725/zupalizetivapemid.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/a105c417e397452cec5d102877bbc1da/ragupawekizipeju.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/10322673471.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210716141311_1539390420.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/pegeviwavugakaweb.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16102f75541153---38336134768.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/51661026602.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/30744616865.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/81412797174.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/zepigimabed.pdfIn PDF document text
    • https://desco.scp.hr/files/2556618262.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c001b9a045---50832242967.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///9049429035.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/77977603983.pdfIn PDF document text
    • https://blugarden.eu/file/51756314027.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5668eb1bf---25681085201.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd965450c---65137356301.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4edd3852---35248919755.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/ziwozebasaxon.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/94523383931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=electrical+transmission+tower+types+and+design+pdfPDF 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_off0000ba78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA78 15192 bytes
SHA-256: f00e4befb69e0d227e1d82affad80d322db723e1b54021c2c0c2e9e88dab286b
font_01_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 11148 bytes
SHA-256: 157e8abb6ca8d38277dda3ff27e9afab0cc104d8c776b696e6cfb6d6dd00aafa

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