Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56571c28bde9f7b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 14:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e8effc534b285ea55d1d304ddfbca93 SHA-1: 2d36eafdc5080ecf130ba3c93a350f45b1ea16e4 SHA-256: d56571c28bde9f7b3dabfb0fb150710786c52a2e56450b32392e0b36487ea963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead the user to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=tubemate+per+android PDF link annotation
    • http://pappteam.hu/userfiles/file/43803592102.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/27010860037.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/ketamelafuwul.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7199d1p9oe4gasesc68gfeuql3/zijesujupowoxilomojuke.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613041fee948b---lidazoxirajapaziko.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/63857815864.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3f5aa40b---lazusoxodiluwokuzafajejov.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/10774845698.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/nivoxotatoraluxedi.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/11797235232.pdfIn PDF document text
    • https://virker-ikke.dk/files/10341267400.pdfIn PDF document text
    • http://teplospectr.ru/images/files/2654210820.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/41989779253.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/wisud.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/64020920991.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16137c5887fba6---vulemuv.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/faxuzojadolunisoduvufama.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lufisasifu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/44700415047.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/1369507819.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/612ed4ba69b7a.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614149880efd7---fuxubasewixanikeb.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_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 18420 bytes
SHA-256: 9a7ae51785d2f71d7e92b8f8ec33cc0b5d4d5088aa797df809e515836e7d1c5b
font_01_sfnt_off000101f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 10540 bytes
SHA-256: e8447c3cfe4c64abf3f55a378de33183859ba2f280788fcac66db2587199ec12