Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf6f8bb2ca7244d…

MALICIOUS

PDF

99.8 KB Created: 2021-09-18 15:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2818c545f3475e579d64f1bd2b84603 SHA-1: facfcc4bcee673d448e0125db33fc0a16b0a4a04 SHA-256: dcf6f8bb2ca7244d3bc4fa77a4862b8b9e87cb8a17355cfefe66533ed8a3d37b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised or malicious websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The embedded URLs suggest an attempt to redirect users to external resources for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://dovolena-jiznicechy.cz/uploads/49662534548.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6c8219c1---mikubelubivosisupov.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/75754311421.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16145bac44febe---60458851917.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/45924859895.pdfIn PDF document text
    • http://aven.su/userfiles/file/37674212682.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/lekuxanomut.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/79617922095.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/jurujabakatata.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/18876645500.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/belogamo.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/8109656370.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/koxubusazudoxigabad.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/62870305124.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b37a5b50---4218367378.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/21897519220.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/23390979601.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/65722349124.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/sudojefipijetekemeved.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210901142437527.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/41728601377.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/penudoveve.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/228830834814ba0b4bf63b9671078597/nusiroxow.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/lanoveto.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/xagilojakawinijebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=insta+free+likes+no+loginPDF 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_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2C 10432 bytes
SHA-256: 2c2e92b5571a31d2b346de06ee9c1c4d24bfa67f77adaa1827bc558284748c44
font_02_sfnt_off000153ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EE 17504 bytes
SHA-256: db4dc54c1d9123ad779533028aa4ab64b967a1fbf666c005328e8c7fa7266424

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