Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ee63d82dcc6cf5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 12:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 09dbd61ec6c71a78cef8804e89b5a25d SHA-1: dc84bdb41d15df4a95445dc20c9e9592dd5878ae SHA-256: 58ee63d82dcc6cf58697c87889587670dca458e43c0f2ff33d0b821de6196dc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to numerous external PDF files, many hosted on compromised WordPress sites or disposable domains, indicating a likely phishing or malware distribution scheme. The presence of embedded JavaScript suggests it may be used to execute malicious code or redirect the user to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://inprovitargentina.com/ckfinder/userfiles/files/lizedab.pdf In PDF document text
    • http://tw-tms.com/uploadpic/xw/files/80821186660.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/161431c5a5710c---37577966470.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/kulaporudutafirifaf.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/verimivubebubum.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/fiwasupom.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/kadidogamufid.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gcgf8vt5ivj6q5elhn2k6902r3/53492214400.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/90328656698.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/65757890728.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/68618c560fda8cbcd838553e8652940a/gakuwozudemimakarexu.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/zisamawuralixasozejatowe.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/wejumazutasonalol.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/razek.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/dikagixumozoboxadiv.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u1d00hqup9bttdsavuj6btrgpq/3962822484.pdfIn PDF document text
    • http://bjsddesign.com/filespath/files/20210911032215.pdfIn PDF document text
    • http://hasyo.net/files/file/derifefuwokijogumaluwabu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2c4d05---bozomisakemagojeb.pdfIn PDF document text
    • http://sns.hu/_user/file/71874209482.pdfIn PDF document text
    • https://asi-filter.pl/files/file/wakoreludadolideb.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/85657383198.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/jefojusogarafijejud.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/98235782464.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/sugikuvixadedere.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/mabow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=life+after+legend+marie+lu+pdfPDF 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_off0000bc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 10612 bytes
SHA-256: 0a5eb4f899a1ed77034c6e75b05b2fe2568bd576e957f37a6170210bd0686708
font_02_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 15680 bytes
SHA-256: bc9572dc36b3011dda5496aaa0fafa07bd0d2ebe3ffad8c9a10829777f0349cf

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