Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0358582dcde209e…

MALICIOUS

PDF

66.8 KB Created: 2021-05-29 13:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8cfc78ef03d743107f88b44eaa07d31d SHA-1: d1947773a3a993c1fbff09a695f739eebdf14b82 SHA-256: a0358582dcde209ef487b0ea2b8c5741b1ed0623f64a3a56e3759decfb5c7e79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs that point to websites, many of which appear to be compromised WordPress installations. These links are likely intended to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://twr1115.net/files/fckeditor/file/dutuwuzoxesil.pdf In PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4no33jsd7e2mak3f05sopqs5ql/gugobizibazakogasa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee429b7ec---revaki.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65977923f5---waligujeluleluxoxipexofu.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d1fe2b1f5---90719842954.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/1f391rmrdgm9p1nqga88h6hun4/jugifaneweviwu.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8e31f05aac3dda6b0f8b050f452f01f5/22447168213.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/eko8r4qdka9r3r7bd960qmn5o9/butifozinununuvewabuj.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/bujewasukubod.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/81b47221dacee887152e8902f0bfcf55/74723452581.pdfIn PDF document text
    • http://gyobel.itpublic/file/55260842149.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4965364c87f81e365bf26ba3ea125493/26410767130.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160905f4f52b53---zabalimodojan.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/vf6n2q9ntqhgsie8cp10tu80ju/xilezuxibadozuvogu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089c9c110bdc---81186664532.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd110155d3---82509537482.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/litifunesiwuxixonew.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870bd80d226---56474325551.pdfIn PDF document text
    • https://uifserver.net/FOROIn PDF document text
    • https://forum.uifserver.net/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=samp+servers+roleplay+espa%25C3%25B1ol+2020PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59E 5716 bytes
SHA-256: 58dd22e6b5821eadee7144f4df36d1be4f02f216e07dea07dc4249266c3cbcf4
font_01_sfnt_off0000d8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C4 10464 bytes
SHA-256: 6a11f13c83d575dd59b2aa39be128db88575f98ece05bfa7ac977451b2ced45e