Malicious PDF — malware analysis report

Static analysis result for SHA-256 0395885fbdeb10a8…

MALICIOUS

PDF

74.9 KB Created: 2021-09-17 10:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: c124ad5ac98ff0a97c0decbe64a40f0b SHA-1: 3d52297a0e1858707a95315d87742311e8eb764d SHA-256: 0395885fbdeb10a82aecd481c006c77ba060059264c70acc67900245cc2f0612
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for malicious PDFs to execute code. It also features a link farm pointing to external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://cructi.ru/uplcv?utm_term=the+wolf+among+us+mod+apk+download PDF link annotation
    • https://telorgabus.com/contents/files/16396200442.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/zabobitewevugonaved.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/85740010159.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/6994403657.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408f6011ac6---2003162983.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/73565004068.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9f542d79a---83792124929.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109161756244451.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/sikezerigakivo.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/26622160392.pdfIn PDF document text
    • http://vhshf.de/File/79412503830.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/12065891951.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/11997142940.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/famuzupemaduzugiregipezu.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109031102551994.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/65899408843.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/81511816631.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/somaripediniku.pdfIn PDF document text
    • https://limsurempat.com/contents/files/pozovuduferunilo.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/45387580250.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/76785157749.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ac30394fd0fd3174efcbc934af4861a/kexoxo.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/nonekutujazanejirotejoreg.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vuxebavepov.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7c6d082a33db38902eb152f34aaafa2f/sabajuxan.pdfIn PDF document text
    • https://isleo.com/i_photos/file/sezirusakabodokatemavo.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/xinajojazojeropebejofomug.pdfIn PDF document text
    • 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_off0000bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 17584 bytes
SHA-256: 6b1eaf00c4321ebf09a2a24fef4e270155f8afde536c2642cfb3afaf5da28128
font_01_sfnt_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 10896 bytes
SHA-256: 5c616bcdf6ae641dd10b3fa06651432325a09d7f346f8f661b4dde2e0b966bec
font_02_sfnt_off000105b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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