Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4048513e693d4c6…

MALICIOUS

PDF

68.4 KB Created: 2021-09-30 18:08:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: df5760982d8b4a39b80b182f672e3bb3 SHA-1: dddf6c2c270df176f8b04e0ae778de005756c932 SHA-256: e4048513e693d4c69de6ceff25cfd7666b9ffae0a0095ad90dcc1fd234daf3d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=idle+mafia+mod+apk PDF link annotation
    • http://h-n-s.net/userfiles/file/povufimiwijobanatapiri.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce7c7a6e7---wiviwopukogufadewupilepu.pdfIn PDF document text
    • http://xsteelstock.com/d/files/35096017655.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/s4mpsdqfkvk5ficutuc5bh9e1g/kujaj.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/79272707087.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/74297062705.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2d9da8458---wedawotanugezu.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/64089026429.pdfIn PDF document text
    • https://premium-house.uz/images/file/zabonewirusuge.pdfIn PDF document text
    • http://demkapi.com/resimler/files/xamekufezifowiwoxo.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_22_15_49_27_1087.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/56714212969.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/lijumutesufurazadezeti.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/7da68adee24362b0e82330829aae0b1c/megimom.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/66385680750.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109031451144975.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/ketuviletowitisaxakexov.pdfIn PDF document text
    • https://oferta.lt/i/File/rewufepo.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16151b8cb016e0---79072458334.pdfIn PDF document text
    • http://52963566.com/upload/file/202109061750426915.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/mozetedavizadewevor.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/wibomez.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/gekitozexela.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_off0000af57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76E 10232 bytes
SHA-256: 861c2113e8d6e8643c16e620c14993d62bc51b212a3794e096fa48cb6d6760d9
font_02_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 15304 bytes
SHA-256: 7cdb21f07587d0780d218c607f65c4d67f2a25e6c17edc27aef42859d193ccde

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