Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3021e57c15c62d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 19:20:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94d7abbb142d2150b23244d15c480e5e SHA-1: 8771068b67538a54ea62abd5a82a44d418057ae0 SHA-256: 5b3021e57c15c62dadd6cf25b8af103e9a9ead9470d3f9d7bd457fdf7fcdfae1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/82f5eb5712bacf03d27a0adc7d03b849/meseravukidavomobewejeber.pdf
    • http://mega-gold.com/userfiles/files/fikax.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/1ef2e2fbc30cb23298ecaa5a31c2df16/7431625051.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dblhfe9dnp03md8n1slloufq33/katolewewipubudi.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607966d6a4b2f---webasiridevu.pdf
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/xekem.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b9096e0b3---56451697924.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2c81c0200---mogasinan.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/11050254229.pdf
    • https://aykutemlak.com/upload/ckfinder/files/muraregesefa.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/b189494be5e1ac31b72e9b813fdafa75/fuzinaturufubinaxujora.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/ojb7r3im9brv1i3unu90s3mlla/gefijakanenitaro.pdf
    • http://sieuthimaynhapkhau.com/upload/files/kadilomifipinuwizazi.pdf
    • https://takipbizde.com/calisma2/files/uploads/pawobeze.pdf
    • http://xibuhuanyu.com/filespath/files/20210826005205.pdf
    • http://curry-box-deluxe.de/userfiles/file/nubufobajefiditexoxet.pdf
    • https://fallsplat.se/file/sulonapodugo.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/f115596f921d36333d8414ac94fd6e1f/tivokavoxajarusoxizewupab.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/9d32m5bjoot7p38neja8et620h/69215248209.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2fad992ca4---lupobiwoxeta.pdf
    • http://knuhpharm.kr/userfiles/file/20210723124421.pdf
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/32899922612.pdf
    • http://gorisum.net/fckeditor/upload_file/file/567612970.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=asana+pranayama+mudra+bandha+swami+satyananda+saraswati+pdf
    • 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_off0000dc57.bin
148e8c922b09600546552fad445b9c4ab91033a849dfeb7baa137fab63793a9f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 10888 bytes
font_01_sfnt_off0000f525.bin
9ef4a6f3c8fd0c6717fbc73f7462c7ed60bf6b7edffbd33997bcdf289c70f499
pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 18620 bytes
font_02_sfnt_off00012558.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 16792 bytes