Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e284a1407e5eeb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 01:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99c938940805f7e9577c9d329a5bbd68 SHA-1: 6854153678c5114d786353624a72db395e48d45e SHA-256: f1e284a1407e5eeb8d2c2b0b34fbd80d16308856a18a26f62acbd5f79309484d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://allytemp.ru/uplcv?utm_term=joystick+app+for+android PDF link annotation
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f66b3eeeac---84203928133.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/64992024942.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/78a083c9094fdf5cb812f67487ad8f36/bozima.pdfIn PDF document text
    • http://jawarakreasi.com/file/demidalesukokiruvirepis.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/96266570241.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/58633088103.pdfIn PDF document text
    • http://bjdfszwy.com/filespath/files/20210912145728.pdfIn PDF document text
    • http://riviera.az/userfiles/file/vejuvilo.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/povewijiwojoxitiju.pdfIn PDF document text
    • http://saaretravel.ee/images/file/libopewimijaraxibinif.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16137f234b094f---86714856984.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/17100141698.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/zimoliwopiguwawemodo.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/xuvojifu.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/6475653872.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/giwupajez.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/14166149584.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/tinomodo.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/fekejobivajazaruwuf.pdfIn PDF document text
    • http://mousike.it/img_ins/files/rojalolanewusofuxidu.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/35346133776.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091013124173499.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/83442166931.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8c00ecc67f1cdb35276e7fd25ac23a44/59959862064.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/56519632067.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/11653172529.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/86727374142.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_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 18140 bytes
SHA-256: 78fb9cc2f31b0e33e49301dcc647ecc1c8927e0ba3bced69cfeb3adbd663dde2
font_01_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 10632 bytes
SHA-256: 7833653d3cf160b5711016ce813644ad42257efc140f631f55d08553820591a7
font_02_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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