Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30f0a177c708389…

MALICIOUS

PDF

115.0 KB Created: 2021-08-20 08:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9a02e58f4b87243cede29c3a5726cf5 SHA-1: 37a0a1f1a1d05eb70be5982e6c90829362042f53 SHA-256: d30f0a177c70838989c285fca31f05463412fbf65d66d81915a882297cd9585d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and a high ML score. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and the nature of the detected heuristics indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/4d357cd0770b16c5dca5d3a8948afef7/lekupebo.pdf In PDF document text
    • http://bm-shower.com/userfiles/files/45164158594.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/konilo.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072caf6ba241---14913511703.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210624081630321.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/jagusevoliguxox.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210811125613.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/zilezamopamidelibipes.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/f869fc3bc6ce5d3b32cc4342289cdc56/rosazu.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/45613019719.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/31b19388864375fa09a6413748674455/lerefenejigosupetepebiku.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb525903c6d---16860803329.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096f120ed3cf---70116928030.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/589ba03388915dc28c0da63c7ee1be29/daxiniludikogazi.pdfIn PDF document text
    • http://kaies.net/upfiles/210720182113929243ks58us.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b683de141---89523800320.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/wuxaz.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/49411467065.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/luxuvuxoli.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161031be401b00---mutasoditawubanunuz.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14479471100.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9caa622c5---88379838887.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073196fee54e---banavilal.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/14783320540.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/43488737661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+much+is+the+gardner+school+tuitionPDF 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_off00015dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD2 17608 bytes
SHA-256: 17e8b3db038ac4884e9572d3b1eaefcb0dede8afa10a06463c3e9e1856657596
font_01_sfnt_off00018c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C1C 10992 bytes
SHA-256: 48b4256cab339ae792d3b4200335dceac9212a3eb8fb4d221401220550a8c3a4
font_02_sfnt_off0001a54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1