Malicious PDF — malware analysis report

Static analysis result for SHA-256 aab9fc6f2c4c6f2f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 02:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32b82df2bea9e35e0f5b01159d84bb9e SHA-1: 0fc100943f55568d182aef7120efa3fe6837f68e SHA-256: aab9fc6f2c4c6f2ff911514bc16f9e103d77fa700154c16299949facbdaad8ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to disposable hosting or compromised WordPress sites. The embedded URLs, such as 'https://infrive.ru/uplcv?utm_term=justice+league+2017+tamil+dubbed+movie+download', are likely intended to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=justice+league+2017+tamil+dubbed+movie+download PDF link annotation
    • http://nesthomes.in/userfiles/file/99185295032.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/zubukizut.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/45935575740.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613450a3b0795---suwosululudemodefu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a117daaac0---levapeguxotumatenuxi.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/33958450994.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/35846716439.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/bememivivikobugobigopab.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16136162103f54---pumunugukomuwujaxiselapa.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/84227074060.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/fipipelov.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/67954277094.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/ripepuwujewawob.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/44092473825.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/bisiwetoja.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-12/images/files/2062946903.pdfIn PDF document text
    • http://esangsok.com/upfile/files/5111718249.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/14342870266.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/33113260266.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/dd882d4785af2f2474d0f8520087ae56/kenevizuropof.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/losirilalowariwidusojoj.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/tarakun.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/zusamoxeluxamafova.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/zalapawijazamutisapibi.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/79820771194.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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 11340 bytes
SHA-256: 9b2f671a1da76e84068ea5a7390cd8beb13f0a0334572688a19f904307ed929a
font_01_sfnt_off0000ce9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 18504 bytes
SHA-256: 852ce81f76422a1c3f4ea04fb783c26ab138d6307c465e4de7bf50a69b00ff43
font_02_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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