Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58524ccfde0cdbf…

MALICIOUS

PDF

76.9 KB Created: 2021-09-04 12:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 935e9ce07d611225d2b216b625b570a3 SHA-1: db03c236ab75081d8997d9ff19b1416e7c12bbd2 SHA-256: a58524ccfde0cdbfdae225a8d856c7502b421edf92fbe30661d30642614141bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple disposable hosting domains, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://everbeenmagnet.com/js/upfiles/files/dovutojod.pdf In PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vezuxulivafubul.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/furunutoz.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/69e89a9c8b98fbca9e0ef58a88579b1a/1967958084.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087b76f530ce---godilakud.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/fapej.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/6jp7h330cdv1et7apjr4cs8s31/58363235646.pdfIn PDF document text
    • http://pvvc.cz/files/4937125594.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/losulalulevepojiti.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/42867262065.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/51309433410.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/54798416973.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/54355019290.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/gisixejut.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/77808174375.pdfIn PDF document text
    • http://remobudostol.pl/pliki/soneduz.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddab26621---13455301531.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/xutavi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ce6a894cfe6d74d620499404987c7853/82852875349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=duermete+ni%C3%B1o+pdf+download+gratisPDF 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_off0000c3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3DB 11236 bytes
SHA-256: 2d633f5d722237f6a581565c3978839b96d51b966dbd789c5a28dde912ba1531
font_01_sfnt_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 17824 bytes
SHA-256: 3063476d25c69bb98d48cf70c3d9c2ad3d821547792a984ab509b6811533ba95