Malicious PDF — malware analysis report

Static analysis result for SHA-256 61caae86c4aecc1d…

MALICIOUS

PDF

82.5 KB Created: 2021-08-21 13:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 922ef471587bdb3e30428c36706bdb12 SHA-1: 3de7f55fd3564ae8a8ea090d97b828e09b87c258 SHA-256: 61caae86c4aecc1d4dd501b74fced6792d6157993191bbf5b5452b91b5744878
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites, suggesting an attempt to redirect the user to a malicious second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://headrepublic.pl/images/files/favulebuxuwimetumowefe.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/o6hlaofusr5opehhjgrcdsfe84/gorej.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc6e45db8---gabolisajujo.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/aebaf5ce569b60c9cf0df460308908c9/48815525052.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/b39fd7a45c33bb2ce81219fa54b39c3d/kitudezepebamovurugibirat.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/bateruzipajazupozo.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/kaginufikoxumijat.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nusafavazubu.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e70f3d3ac---4225650709.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/kuvemitu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/1df07273ecb6fac58d38d2769becafaa/9666677028.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/55689173507.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/ritivinatamefanodupufo.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/a9c6586c05aee86d6b33ffbbe0a70770/nesisokuvop.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d24fb8bd3a---vezimirepitikitudoto.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/papixururijufujo.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/keradeni.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/ln8ko9o92j2kcmrafh56r6n9b1/ripugeganazuzeke.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7d246787b949e29346a6e49a01616fac/19932661027.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/98420897170.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609962d601fd7---jupen.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/89571292201.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/xofumodamogaxi.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/25041878763.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/40595678192.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/70838777843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=converter+pdf+em+word+gr%C3%A1tis+on+linePDF 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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 11040 bytes
SHA-256: 0512f60cb15ed1f4be22d124cc885781de536aac178e1e94f1241e43f6d5d3b5
font_02_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 17040 bytes
SHA-256: e3b12f1de6684cfc93936f7c2fe345da250024db8016d9c72e7ff824ee082aaa

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