Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa05e74f1c98e03…

MALICIOUS

PDF

89.7 KB Created: 2021-09-03 10:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20bb910694d68d2d17296164fe87fdbe SHA-1: 297c660acac7cb5ea8c75aeb4b77447fe9c21633 SHA-256: 5fa05e74f1c98e03e98a55e9fe8237e94208f491581935eb43dfa1046304ea67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm that points to multiple distinct hosts, many of which are compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No specific family could be identified, but the techniques suggest a downloader or phishing lure.

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 http://wooshin.kr/uploaded/file/71487487360a4f1bf69bca.pdf In PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/21070817285065825971h2t7.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/fanidovugadobigevodumuj.pdfIn PDF document text
    • http://gerocuki.hu/user/file/zubagefosajelez.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608898ae84d68---2485647278.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1a356d8eafb893ca1acd76e96b6e2857/retazurixoj.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/pixasedosusej.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/sikuvirebob.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/pevexu.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/gefixatuduxebepuru.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d257d7928b---mumuxubisefopikemuna.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/sokasava.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/taselerefemos.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dutatogukapawi.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/gofuravavitanivisuz.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/witas.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d3257f89ab91af0f2e385fe87bed21d3/17135722052.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/lowixukojidipiguxadijow.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1a73a0849---43230353073.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/rm7972s784hcq679run2tjlfs0/20394408881.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/e888bd4ff62ee115ab5e14d2df7bd612/wigixumogevasanalej.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4775dcac4---35898178554.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5362b4ecb---bizoze.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/parenemosupebebupogidagax.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/39387371162.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/96216948513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=homophones+worksheets+for+3rd+gradePDF link annotation
    • 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_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 11148 bytes
SHA-256: 0c78a1493c04906ab81fc78a7555254c46f74f96287fb05c2f6c988c9d8a0ff9
font_02_sfnt_off00012c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C96 16612 bytes
SHA-256: 35ae97d7d349532b0d7152de920aca1a109af85b9b02c264316c91919165d432

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