Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad6a59b3c27c7ff…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 05:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0a284c6889ba3014acee5fb6d78ff95c SHA-1: e2cd93ca89442883ef2de33dfe292972757be322 SHA-256: 7ad6a59b3c27c7fff078541e8073b59c952483a0610fd970867c7f4795af74d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicative of a link farm or SEO poisoning attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chcial.ru/uplcv?utm_term=how+to+hack+fb+accounts PDF link annotation
    • https://oxfordjsr.com/userfiles/file/vukabu.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/52393989256.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/ziwewetimutowat.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/80514704730.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/14509488291.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/42983853777.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/vigewilugavoko.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/tumugafomike.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/wiliwipezidubisejosez.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/49827300219.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/48a61e2c3a7b02fcb7a953a128344231/45207275972.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/teroborevebidupumogimoda.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xunalofovumipozafisek.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/fb73b6ba460c4818ba3a561c98bc41c1/xexebuxilu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386ecd5a7bf---7120580495.pdfIn PDF document text
    • https://proxus.nl/file/67858461520.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/66461059961.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/79467275866.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/17622480886.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/muvikufejojakit.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/91430319951.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b90b1c1e3---ropukilonexaxikate.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161316fca65ffa---finaxu.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_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 20040 bytes
SHA-256: 9d3071f265a7c44c2649d2ee81253f89370870c718597b65242ee93401a7247b
font_01_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 10472 bytes
SHA-256: f24d41d1ccc8e1eb3bc00626de33c69b7199170ab487bd6acb065153422cb987
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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