Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec146d1bcbae3a7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-18 08:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b4865a62c4683a0aa11f77fbe1d01313 SHA-1: 6a8b104b96036d1786a7641a6f34a0be003d20a8 SHA-256: eec146d1bcbae3a7516f6c397cfc0d2d6546f5fb64237ca09ba6092faa6df994
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to PDF files hosted on potentially compromised or disposable domains. Heuristics indicate a link farm and a deceptive download button, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=naruto+boruto+ppsspp PDF link annotation
    • http://wawabed.pl/uploads/userfiles/file/54374398354.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/59836007779.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/41409590102.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/mapozomu.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/velusuzapom.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/59587999746.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/pavexisivatilef.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/wotitotugoge.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/65359639316.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/15959620120.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/gusigodasagukuwure.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1b2112cc695b09c4add7cce2b88e4883/90861864160.pdfIn PDF document text
    • http://kebirbeton.com/userfiles/file/19207516977.pdfIn PDF document text
    • http://mylodge-naoshima.com/bukeweligimi.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/4a0258c90ee689a5cd20b434f7abc83a/43517770980.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/42083249888.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/sififid.pdfIn PDF document text
    • http://expresskaliski.info/file/zipaji.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161453d1e22c2d---88448542455.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/8728918403.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/48436673265.pdfIn PDF document text
    • https://greenways.at/userfiles/file/podaxuxofivaxiwedunobedal.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_off0000bdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC7 10088 bytes
SHA-256: e9ffbc22a5b9dc90fa26ac31d1ae924ec7eda7c1e8a66ebb645c272f7c897931
font_01_sfnt_off0000d434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 17800 bytes
SHA-256: 93dea9dea0dc46401ecb9f660f044284bef6e8f2101a1eaff5922c8edd55f009

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