Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad379bc67635f7d…

MALICIOUS

PDF

87.4 KB Created: 2021-09-19 13:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eb51a4bf14ab81fefe7f3d11d0d2012 SHA-1: dc2ea40158dc387fe0826c978bc3d4fbe18c11bc SHA-256: 7ad379bc67635f7d626e6f372991edb3ed2e636a12ed689017d895d0bf1265cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. It also features a link farm pointing to multiple distinct hosts, some of which are associated with compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The presence of JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://beysukonaklari.com/ckfinder/userfiles/files/29108266743.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/gefeboxavares.pdf
    • http://vcvscr.cz/www/www/fckphotos/file/54910550879.pdf
    • http://ttccid.com/userfiles/file/97846154697.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e63fdaea6---ritoludokakas.pdf
    • http://coinproject.com/userfiles/image/file/59585272420.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///zowopufigobijudemipavuvam.pdf
    • https://kalyna.ua/sites/default/files/userfiles/file/lamonoxolotatonemaj.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210907065540.pdf
    • https://susta.vn/userfiles/file/61903328221.pdf
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/butoguj.pdf
    • http://helder-effect.nl/userfiles/file/36626477178.pdf
    • https://marupyara.com/fotos/userfiles/file/86030229471.pdf
    • http://yibetter.com/data/files/noparonu.pdf
    • http://shceping.com/upFile/photos/2021-9/file/nisofaremudabajifoke.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130aae1d3a54---48802326728.pdf
    • http://scandirent-new.ru/uploads/assets/file/9221181086.pdf
    • http://tydafa.com/dafa/uploadfiles/20210905125647.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136afc7bb310---pidavajapamorisiwibixixug.pdf
    • http://konemara.hu/userfiles/file/79179873564.pdf
    • http://fine-trading-knotwork.de/uploads/media/83077211976.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/161319ebd75f12---82545183807.pdf
    • https://pemaboutiquehotel.com/assets/userfiles/files/pipowokibiwemabopimojata.pdf
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/41259394556.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/4431154b24174e2a9c70676448761b79/kedupatolasodojiloxafo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=open+chrome+browser+in+android+using+appium
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 16792 bytes
font_01_sfnt_off0001039b.bin
cd274471a1d5b904ef647e53d75c30b4b7cf5e6814dcb028f372d09b46576323
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 11168 bytes
font_02_sfnt_off00011d20.bin
fe5e1afc2c3d87721046e716d7867e1d331659a7d0f7b78909f2d5af4f63b21b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 19260 bytes