Malicious PDF — malware analysis report

Static analysis result for SHA-256 97eadd69657cb621…

MALICIOUS

PDF

88.1 KB Created: 2021-09-18 08:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b63bca6fd5b0ca1ceaf87aef1305b0c9 SHA-1: 1974d3ab4305eb140534bcc24678a52396ff0e51 SHA-256: 97eadd69657cb6215a455257564ee9fb54584f28a3aeeeee68182063e5a307fd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure malicious destinations. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous URLs suggest an attempt to lure users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://ykitraders.com/UserFiles/file/vezizugiborugozi.pdf In PDF document text
    • http://bobas24.pl/Upload/file/64136350870.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/wanawinobigavepu.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/87171752641.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/vivupepasira.pdfIn PDF document text
    • https://almavilag.hu/files/files/76841879914.pdfIn PDF document text
    • https://kiptep.ru/file/zitobudadije.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fijojow.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/61780968397.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/98674529171.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/95912431385.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/5e9ffa9aa3522b0b339049e4b5c74d14/50972439778.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/61681705293.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/12107818963.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/9ef6424cefce790df6a510c864d66e77/20017366817.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/46045153703.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/74187603985.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/zagubeliloxonadoje.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/lireboran.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fddb151dc6---49113470685.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/25545160879.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/84799794281.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=live+channels+apk+downloadPDF 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_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FC 10612 bytes
SHA-256: 01b59a890e830405b232a3189e577505e0b5817fd7ea91dce80c3481228664ac
font_02_sfnt_off00012132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 18936 bytes
SHA-256: 852146cffb1dd7eeb838fe9f64b1c31fa42d78920b4fbe6cd1d585d5538c7034