Malicious PDF — malware analysis report

Static analysis result for SHA-256 94bc29694031e73c…

MALICIOUS

PDF

83.4 KB Created: 2021-10-10 08:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3bcf71297d3b99e259a2456bf57f9a57 SHA-1: 4359ad56d9c25a26cb501592fa061e23f609203f SHA-256: 94bc29694031e73cb65093a0d42af8dd329b0b1d1c7f47bd5402f9cc9469c64a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links and the compromised hosting strongly indicate a malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c346077c42---83250700550.pdf In PDF document text
    • http://wabasnb.com/files/fckeditor/file/14694439166130c4801e66f.pdfIn PDF document text
    • http://partnercable.hu/files/90511694598.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/9307cd.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/lujugusapujafujasefe.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/soditakuxisadijelit.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/64377399341.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/latelujuk.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/72950356757.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vipumezelebolufezutofaf.pdfIn PDF document text
    • http://superbarter.sk/media/file/22866129655.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/1549381616.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615d357030918---linawutazorogajowudopativ.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/51041293827.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/vijefuwijujukaxinijin.pdfIn PDF document text
    • http://poorclarescork.ie/images/nidawunulijarefim.pdfIn PDF document text
    • https://ratodua.com/contents/files/dufop.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/jazigorigagivokazifa.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/48540443426.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/bomuvaloguzagir.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/lomifu.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/gu16sj9sesg88f94q8papujqb4/gulifopudorap.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/gerafofujudediniremaratez.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/xigiron.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/89945008218.pdfIn PDF document text
    • http://3234.us/data/attachment/file/tolusisezobuse.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/pavojudinefawoze.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/zoxusitesazazaxitolufun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mixing+single+stage+paint+with+clearcoatPDF 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_off0000dd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 10836 bytes
SHA-256: 8185b7ae1b2d62aa21fc196ee6468f830732a274f86e0f519b429a6d023ca0da
font_02_sfnt_off00010e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 19428 bytes
SHA-256: 885d9ca827233d4428ca992620e6809ec0a50af1fa33f3465dc73551d9ec7936

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