Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78b59240778ce90…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 03:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6300f9ffcb4b55bfdfa07c9092657639 SHA-1: b652443dbdf9865b63bbdf8278e1a5383b163c35 SHA-256: d78b59240778ce903e324e8cad2728279540dd9be216147b8a8545d68f9688f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://strandedtattoo.net/file/79315183313.pdf In PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210708_6D7A52E88083D45C.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/jurulotilerolovoxefo.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/83380227960c235ce641af.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b93395a3f---sagiv.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/26265376006.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/35702335463.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/fabojonikulu.pdfIn PDF document text
    • http://cga82.com/admin/File/tufibujijisamulirugude.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/mubabajilimulawumalumepa.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160890b79e4687---sajasagiwojemomunoneka.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607862b7dd1c7---sewukoxusagi.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zixodatuzeniluxedop.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/89939619807.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/tiperivofasi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210609020649.pdfIn PDF document text
    • http://maxbrio.kr/files/files/88190032146.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xubufuw.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/afca8a51fbc40553a477ae50ea074270/bejefubokawiwegemugupezo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096e36e254ef---vilijeb.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/7740959254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=kindle+paperwhite+manual+updatePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 15908 bytes
SHA-256: 33eb17f105a7a703bbbf82625c807757f95d407c827e6aa6cc50a9a3e8162a69
font_02_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 10548 bytes
SHA-256: fb2ea77138fbd2d116adb77d20cc47f0b218cc7f45c5d33d5459034aef358951

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