Malicious PDF — malware analysis report

Static analysis result for SHA-256 135ce5060674a1fd…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 09:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 985e54c7061e8b0f721a921e06fbc1ff SHA-1: 14b84cb9b44957b1da44056827bc5825c2bf7d33 SHA-256: 135ce5060674a1fd2b98b92d960447cbbd04c542259a75e1c53ef4f1edbbf1c8
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which appear to be compromised or hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://theheavent.com/userfiles/files/libudoxuvuno.pdf In PDF document text
    • http://vodnik48.ru/content/file/78402971260.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/emouuklkg3ahaf85jnhtshktcd/85967315953.pdfIn PDF document text
    • http://mobiliteit.nu/files/76661540844.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/nizeravitur.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608319bda1dc3---xekiboravapedonavigisaz.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/88510949025.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95af6a55c---87229319734.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/48754572799.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/nupijiresukipe.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a3f1ca347---dokoxerunabi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/98bfa9119a65dc1c7d97127394eb6306/43752386864.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/lufaderalepibunopipexabo.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/50752702509.pdfIn PDF document text
    • http://allycatering.com/userfiles/51687433261.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/segaxipufebunelibakexede.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/fejivovipubad.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/3h582ir4ol9540afdtqh34tnek/95539254104.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/dumisitizigobulokirekala.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/f64d948be1b3be0272e5b7d7efe98b12/melareguxopozuradovatowu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10a8bbadf---fuson.pdfIn PDF document text
    • http://asid.rw/userfiles/file/70695806803.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ha29hs0605dhki5h5bp3hdqorr/72108324965.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/51810447497.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/fezaviperefafimujazutak.pdfIn PDF document text
    • https://hse.tw/upload/file/72299990327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=agricultural+produce+marketing+pdfPDF 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_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 17648 bytes
SHA-256: 4ec1f47f82bd5085f6ae8c041b35f3103b609a260991d357ccda535bb9c1be6b
font_01_sfnt_off000111bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BD 10968 bytes
SHA-256: d6376533b13ae8b225548b2fc2cf66d0f06dcdbb07443bf230e51f8f3a2800ef
font_02_sfnt_off00012b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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