Malicious PDF — malware analysis report

Static analysis result for SHA-256 725dab9b5bb789ed…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 10:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b61d90d865d320515d78de4762981dd9 SHA-1: 778c9e1c8b80587c7d9cd0932aeed0ef2e1d5691 SHA-256: 725dab9b5bb789ed356550ce73b47bb51683fe4c60868ccd360634d62f5a20f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing to numerous external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL distribution pattern suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://vinamex.info/uploads/news_file/53701611333.pdf In PDF document text
    • http://palestraarkadia.it/userfiles/files/79287965113.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/delizodisopo.pdfIn PDF document text
    • https://iohrp.org/f_files/files/zapomokajijo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d060bb4a80cb27c440cfbd0fe38af6cd/35499240626.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/50942417481.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/roddggou5g1r4uc8vuppolp55k/59224125924.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/daresisowufopebiwub.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/44728290884.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1234ff3706d58320e540adc41995dc05/38099554875.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/doxowegafipu.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b627e5a65d---danexef.pdfIn PDF document text
    • http://www.polni.si/Images/files/25270303528.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d951020b4---joluxiwanepetetejolisate.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/24021667441.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/2293086746.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/4196768087.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/68950934046.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cce191132c527778ec4fbf4f13bffb16/52283210216.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16124629fe4824---88743556514.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/rujovavusapubixasepovele.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/xiverazexizunam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+does+self+confidence+affect+sports+performance+pdfPDF 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_off0000c65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65F 10860 bytes
SHA-256: ab8d5b4c6c28cd78f809e57b4b4e10c5d6b21baa27b8af5dabc39d98ad332ed0
font_01_sfnt_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 17640 bytes
SHA-256: f3647ea6a987e51f2e29f2f260b474c37c87937608a31244b6541c5bf686ff7a