Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a0a2c25e88a897…

MALICIOUS

PDF

90.8 KB Created: 2021-08-29 20:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a57ea700cd248eb198e06b41e982f29d SHA-1: 1ea5fe654f9fd45c51ca665b3cf3c2c65c0c8836 SHA-256: 52a0a2c25e88a897fca0c6a0714b748930f5b7716e84672c269da612a9bb34f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many pointing to compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly indicate malicious intent. The presence of multiple PDF-specific heuristics related to link farms and compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/m5rcudob60plq7aa0bamm68iah/lafuxudiwamodebuvavomi.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/u90n3nis99r5gqmte6epcltcb0/19685326995.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16114ae12491d3---96794771846.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/81066743188.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098bcd237883---nifitupisenude.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/vowiwemiziwinezaperu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/n2t6vvmhcc709eqgv0jq2r7tek/tiboxerivavawotod.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba27931e3---tusadalobubunikasuzevi.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/wefakepetotafex.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/15125904852.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/fitegowobuzawafapax.pdfIn PDF document text
    • http://gaudi.tw/upload/file/67135520819.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/gogarexufufutubuku.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c45220b5---ronezumuvefuwu.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/15319831568.pdfIn PDF document text
    • http://m2m2design.com/userfiles/mozalexelaxinakugujaxexot.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/78801556167.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/tefugoxa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/hddplmndo340mvu6tiqb9kr6t7/winotawukimawen.pdfIn PDF document text
    • https://bamor.org/userfiles/file/35788840997.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/nataxitoradokemasuneti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=would+you+love+me+if+the+world+was+endingPDF 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_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 11160 bytes
SHA-256: 855f9c71f1af2a3d97ac0457cf670dbc232d446cc0e3a27a04d06065ebe59b32
font_01_sfnt_off000114af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AF 18644 bytes
SHA-256: 7e9606eb6bd1e3f1c125d2171cea5184f7abe0ba896a42aaffc12973a676b244
font_02_sfnt_off00014493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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