Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8064c0b35f1d975…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 02:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 63b590a1dd79b71f3302137a69abc383 SHA-1: 52134f0c45559ab0d4d07c4b70d01b3323c1882d SHA-256: b8064c0b35f1d97587b62a6510de224e54160c4a54c55646081c0346a9abcd6d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt at SEO poisoning or click fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://phukienbep.net/media/files/59503651396.pdf In PDF document text
    • https://seger.cz/userfiles/file/vosanogabukekamagozaribad.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/bbfff205434f80e223619fb00c0cd9d3/zinerumiwerapelulawaguwa.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/33710038817.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/51539368293.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/riwipuburufuva.pdfIn PDF document text
    • http://cutskytools.com/d/files/denobororizeridu.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/telun.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/13445574586.pdfIn PDF document text
    • http://strandedtattoo.net/file/ninemalepotikajabez.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210901_F56561634A0DE779.pdfIn PDF document text
    • http://sinostandards.net/upload/files/83098635598.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/10987723028.pdfIn PDF document text
    • https://dyaa.club/uploads/file/vomitib.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/putabujekozofazikojabov.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109180711327764.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/dubejariz.pdfIn PDF document text
    • http://bookblog.kr/data/file/files/bawore.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/64566201540.pdfIn PDF document text
    • http://hak-al.com/resimler/files/mefuvujabenolozetopa.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613215a070023---tomomotogigeperekot.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/54940606025.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/11980359885.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/28218773648.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/kajedidunovif.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3b22239d---15689777857.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/kuxojitutepuzasotizim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=avengers+endgame+online+freePDF 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_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 18040 bytes
SHA-256: 58afce4578eaaa7ac6b63ba3649325be075d908998e6cfc3e74b3150a72bf7e4
font_01_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 10648 bytes
SHA-256: 2871e260fdb57b1b8203d7250b445e2bcccf10a44c3d4e72eccc0cbb365c9eb7
font_02_sfnt_off00011f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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