Malicious PDF — malware analysis report

Static analysis result for SHA-256 68e1d35d942953fe…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 01:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc7e41c04e22d49f3057f9c4e041d5c9 SHA-1: 116c4a5091e0e8251daf557c0188d9311d11d8c7 SHA-256: 68e1d35d942953fef56284d3ba7e281a71125dcf56a1b1efd9ba1a7f6103f92f
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=bus+racing+games+for+android PDF link annotation
    • http://slmj8.com/data/userfiles/files/movopalubopa.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/pojuzalutoponowejaziv.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ujlc37suchev1jkfufu32dtrfq/rixokuzator.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/369ad4f1689a918f0146e9137d9b99a7/bimeto.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/medebimonilaz.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/56385339027.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/xilemigodufuxegab.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/37309072929.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/30010973611.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/51140974385.pdfIn PDF document text
    • http://iviltra.lt/images/files/9679995784.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/tidusirolesu.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/32875391522.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/99790353893.pdfIn PDF document text
    • http://orderkai.com/uploads/files/90309559655.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/37360554225.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/78832606064.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/80974181215.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf50374d3---nuperovixexuze.pdfIn PDF document text
    • http://taigesw.com/upload/files/nasijojalurezujikez.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/wuduzagaxobenus.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/65699099769.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/79888763057.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/62537479147.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/c548749f9979d4c73a9f08c6ac160eca.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/lekij.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/91335802916.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_off0000ba4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA4E 16572 bytes
SHA-256: 79f3db599353fc7c9009ffe36420a78965c14c5f1d6184510e34d05741b0df52
font_01_sfnt_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 10828 bytes
SHA-256: a554bd43a82063a03a6b5e0dabc5a640b8c1641c7f6ea07cc6565672c05426a0
font_02_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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