Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc9fdf138232c67…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 04:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32f60f6dd7e94becf4f2d75d6278febf SHA-1: 1d80af0ffcad6a11e404cb47bb10494fbd2fbf2e SHA-256: 5dc9fdf138232c67e9a172f61addcab00ef9f9378cb79ba4bb7bc15392541e2c
196 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user. No scripts were extracted, but the link farm and compromised CMS uploads are high-priority indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/6f866c354526ef88230336611609711a/busikugalu.pdf In PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe4740a37---pelosanop.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/fesevevotebexakosej.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc6c2b4da2---8057278930.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/57164519117.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/suvulutasovasu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/tijul.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/27565869867.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nbfjonns5l9abc5mii0ueb9934/68273409423.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0c1a62da0---52504498176.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/pefalibokemuza.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/55522151882.pdfIn PDF document text
    • http://ledesmasportsmedicinesavannahcentury.com/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/63650192049.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/30cbeed6b7297421a9963dee0b87d0bf/netodesedoxeme.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/rofij.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/ghd6s97sukhugb3o0uamqpa9ki/64316045171.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071651b329b4---sufakuzi.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828d958eacb---terusaduzokej.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e359b0ea5d54cf6245543ee16fc9709d/39139270578.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/girif.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c88b8ffc2---dugaxoguvodupewadolodif.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/71696657157.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d01b216aeb425e565f9deb304296df38/3050685393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=indesign+rounded+corners+rectanglePDF 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_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 10596 bytes
SHA-256: 933a6698e9a67b1f19fbbe27f23e89db6af6f486ca009d13aee0ba903f8cece8
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 17996 bytes
SHA-256: 038c48172ff49190ba9805457109277be48c078267dae3ad0b3fd6d58d75257d
font_02_sfnt_off000130df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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