Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62a7e73afd2199e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-03 08:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecc1b324d79b77ca98411c726fc70e89 SHA-1: d04ae695e7e05a12f1148eafa7bd35b1cc8edb33 SHA-256: a62a7e73afd2199e912bbee2152306b1c3c645db10999eda2416a8098f16655e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Multiple heuristics indicate the PDF acts as a link farm, pointing to various external URLs, some hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://glotecgh.com/upload/editor/file/81074090046.pdf In PDF document text
    • https://digireg.cn/upload/zolasuwisigotagolitewu.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/63024004739.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/68042192148.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/51446795741.pdfIn PDF document text
    • http://efrex.cz/files/file/tukadewomibe.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076be7b04aaa---komosog.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/16308087203.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/20173098910.pdfIn PDF document text
    • http://72.47.203.72/admin/common/ckfinder/userfiles/File/genetexirit.pdfPDF link annotation
    • http://baigeleather.com/userfiles/file/lizidefutejelirikolezif.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/kutorazedixinelesazudevak.pdfIn PDF document text
    • http://ladna.pl/user_images/file/90667887505.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/14500062177.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e86cb896db---16807422900.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/dogifiwujaxad.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/jevitov.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160787f5bd9ef2---79624954827.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/75483020947.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/fawukexedokaratufa.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/78053104422.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/40888522302.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/zizujutogiwanuwoniwaminom.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/49144292658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ukulele+fretboard+chart+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_off0000baf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF8 16748 bytes
SHA-256: e09f3ced23cbdc3cc6aa7974ce2892851db94653db72cb2d526712b08ccf0f77
font_01_sfnt_off0000e5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F2 10692 bytes
SHA-256: 159be57067b9ef2507914954f2d93c9d09e0d190523662551750c9f82d8fa75d
font_02_sfnt_off0000fe66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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