Malicious PDF — malware analysis report

Static analysis result for SHA-256 42be1fb082ab1b43…

MALICIOUS

PDF

81.3 KB Created: 2021-07-09 06:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7604271006d43c3f6233c9af64a8b78e SHA-1: d106c619435b4e0724b1e8204831b2fb4ffb95cf SHA-256: 42be1fb082ab1b43f394c1b8e516de11db23c1c7a339e9b00bc755422bdbe846
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and points to compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest the PDF is intended to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://coretry.ru/uplcv?utm_term=android+tutorial+pdf+2020 PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cb099621c3d8e86442d37f9494438ec4/mobubupozutezipejiwi.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/caf02558adda95f79a6068cd289ce726/kuvewifamadetebuwizos.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/10627717648.pdfIn PDF document text
    • https://marigabung.com/contents//files/tafevupunin.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ci8bhqo1o2cs6aabvchiv4kiq6/gezetunulevotepewifalixob.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5cfe904625bd13946718b753c7f90f84/pamuwubopomogefit.pdfIn PDF document text
    • http://gtshotel.it/images/file/95714873305.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/marimabusar.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/40374893622.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xoranomiko.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c852cee8c92---nawewoda.pdfIn PDF document text
    • https://invest.pl/userfiles/file/41853818187.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/80443807715.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcbae9ed643eab87d41dbeac381cce3e/31519824758.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/pefaku.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c1418d857---nuwobolebuvomutivet.pdfIn PDF document text
    • http://fittbike.hu/files/file/luwizomutazewovaj.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/10e8a2a7fc51fa4891c255d9a93bf975/gurubufelajopaxa.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/32bd4c4523ad49ca1d98afe64a372645/xotegixupewenome.pdfIn PDF document text
    • http://anm-av.de/uploads/files/51966826068.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/90859969140.pdfIn PDF document text
    • http://cjatkinson.com/userimages/belafibifekogemerekeberu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-11/20210611082039783364.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_off0000da89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA89 17248 bytes
SHA-256: 57f4ca5a2252a8f70db4d3b0a220f6316ab0fda7109162a80b067119c6b6a14e
font_01_sfnt_off0001080d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12024 10516 bytes
SHA-256: f2eed7bfa5454f9267036a8e0d9a6f658e747eb54f9afa6843226c32a81d19ab

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