Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b50ef07bed3cb3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-18 05:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 407919ea3d66123e1121e937c1931645 SHA-1: 975e7913e7614b124cbc9be3c7103da70a7f7f07 SHA-256: d1b50ef07bed3cb3a87f5aeb6d5211d1dc394e351af36b9ce81fd7f734547ebf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also contains numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kitapkaplama.com/upload/ckfinder/files/94351006551.pdf In PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210912_4C7D4012DDAC28CD.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/serosabozuzimibesugurat.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/26671179074.pdfIn PDF document text
    • http://wwsm-us.com/files/file/25341302385.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/dazuxapuji.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/1ef9872b27ae8f08c3b93cd344777cdb/18031699473.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/wugukuvinewumalepamel.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/94795374104.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/78257054689.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/11049910590.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/b5ee72e089305d38cbee3c15c50314e4/kobuxaxuf.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332925117f3---21789057193.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/viwunofonuxuveju.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///26556080856.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/kavutobimutegefokopod.pdfIn PDF document text
    • http://sinostandards.net/upload/files/dadokinovegurudibaremu.pdfIn PDF document text
    • https://ip-pharma.net/data/files/laguzobu.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/wofevizinalejebemuxil.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/vomutufogarunud.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/59234088435.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/61557179258.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/luvinavizixibede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=videoder+apk+installPDF 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_off0000b6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 10444 bytes
SHA-256: 1432ea6a3ac8cf1bd6c62e5b4038ae325e1d052dbdf5b49e119a3ac04257afa2
font_02_sfnt_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 14824 bytes
SHA-256: e6626307d2168f50e9f438b3ad12de8db5aa541a0334a167e01e790975e201e0

Open this report in the interactive analyzer, or submit your own file for analysis.