Malicious PDF — malware analysis report

Static analysis result for SHA-256 be4b5bda2da5ad72…

MALICIOUS

PDF

75.7 KB Created: 2021-09-19 08:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 01a3425badab8d9bad99a5f7c2f25846 SHA-1: ec6513408f65aefa84ba7c1f76665d67a9e1b37a SHA-256: be4b5bda2da5ad7277beccf8a416f50f7cacf52884c02a786f0e2c378dc8536d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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 http://marchmontnews.com/imgs/file/notaba.pdf In PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ea1a2ccb4---gosasiginopeken.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/7sp2ia67nigcrmshqpvthk8kum/xebetonulajivurulozi.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/91258705511.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e18bacc45ed668e00f331c88918c1a85/torof.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/82938720145.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/lubitom.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/semixuxejabatigewox.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/nadirefa.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/4238693830.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/pibebevasozufepul.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/54263171207.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/50606632961.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/liviwudigirofalugoka.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/tasigijixon.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210914124328096.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/89921280521.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/52541631634.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/zerexejuwokob.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/taxifizesizoxorobafire.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/rupeturodowevudop.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/53298881327.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=preposition+test+pdfPDF 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_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 17580 bytes
SHA-256: f31b5a47f076a51af12fee1e18868867ec60745c1efe40d688a10b59f0c7323b
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 10284 bytes
SHA-256: 921731317628b5016296e35814d75a68a3e07253e85cae794bec89aee5bf2c1a

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