Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b63d8f04706348…

MALICIOUS

PDF

75.5 KB Created: 2021-09-28 01:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ff4faeca9bed874451e01930954ed53 SHA-1: ca2535a622bc13a69fd68313373735dbf26972b2 SHA-256: a0b63d8f04706348d40ec977b1ad674247e21477ae4d819e41cd3585392437ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress uploads and disposable hosting. The embedded JavaScript is likely used to execute malicious actions or redirect the user, while the link farm serves to obscure the ultimate destination. The presence of these elements suggests an attempt to lure users into clicking malicious links, characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://kohphanganhotelandtour.com/userfiles/file/lisupirubu.pdf In PDF document text
    • http://clainvest.pl/userfiles/file/giruzetiwujobo.pdfIn PDF document text
    • https://ratosatu.com/contents/files/99898496715.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/noxakajoxetiv.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/77902677247.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/98378936931.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/totasawotiwakin.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/89609059361.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/wabeku.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/repuwixakigefudaxexes.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/jarobofalu.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/21979762988.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dnd4ch2dq7765r91nehpdr99t4/jotuxepefovulu.pdfIn PDF document text
    • https://thehouseproduction.net/file/wedelinorekobiruvotelesi.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/abdfad627ffc55a87bb73ae5bafa1bfd/folalafomusifokusiveri.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/36193851691.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/869c16e9a579795c0ed9b87c5eb6b99f/narolebugejokaxegutiliv.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/20289608112.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/26579523518.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/tonemirisinalutapotepomum.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/vorifuvavinimixobijum.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/pawamajit.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/wizepopakeko.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/a295c9828e6c9d192db69c6ad35f2d73/35622569581.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/vebus.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/13917114041.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136814330df4---liwelotobo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sync+outlook+2010+androidPDF 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_off0000bfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAF 18436 bytes
SHA-256: fcf5ed310f156c00193e3ea4be62956ec17a1bba37d7a8b4fce04e2406016030
font_01_sfnt_off0000ef02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 10740 bytes
SHA-256: 26478374782a1257234a719f80db86286d53ac7063688ae8dbbf3bc828539ae4

Open this report in the interactive analyzer, or submit your own file for analysis.