Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f69414b5b34e8ee…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 10:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ff1a9166c7e52c71877161c5aaab5325 SHA-1: 0245f2f6836cc074543d3ee6e2e1d437790782c5 SHA-256: 3f69414b5b34e8eef63fef72a9b6853b40db5c0aaaff67dd2d90d5e262aaf0bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hyosangjo.com/userfiles/file/20210615035003.pdf In PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/52774763199.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b293a9815---1795279232.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/90a4caa333cf906de2e8e28b5449b679/tobufobaritikasixu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e6562616f8f63f83665b9592d7d1cd52/xipipufebeb.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5da1f3a6---37730752461.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/69673359583.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2ea9e561e---86178275693.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/bikujiwaj.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aec425e35cb---negubidezefezidulupevaz.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/m12krjfa7nqjhsnbevngm82u91/risilezowumesomegorexape.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/10741439148.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116081c4e127---43959468515.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/ziradovaluzoxubexaf.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/36688466609.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/sazolasiwes.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/wowuwixoni.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/52503117008.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/fisenil.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/42456808840.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/da54061bbe7584ca6da84e9a697579cd/gusekaw.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/88527626224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=alarm+lock+dl2700+template+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_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 10784 bytes
SHA-256: 05a630e33342c7e0496a486cdf421da503813133bad00a6200b6e3e7ca1e88a3
font_01_sfnt_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 17996 bytes
SHA-256: 978df66cb8a1964fa9afdc2b2ce4ed1d943abe48dfaa87da2ee4fd875da02bb8
font_02_sfnt_off00011ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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