Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef4da3abfb9a100…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 17:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 41b1ed18a313fa6aed733f0729f12187 SHA-1: 2242533ae34d1d37459ef37b922fa6c67caac609 SHA-256: 9ef4da3abfb9a100ed0647e1ea2299a1edef3649fc6f2bbbe34ba3da7ef57618
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. The embedded links, such as 'infrive.ru/uplcv?utm_term=pokemon+go+offline+hack', suggest a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=pokemon+go+offline+hack PDF link annotation
    • http://automyjka.pl/automyjka.pl/userfiles/file/52824344217.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135738947b79---90705810495.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/kofuxafoferisuvamatax.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/zolozotobiw.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/jukalulu.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210903182033.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/sojiwevibewadote.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/vogolo.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/43i972282ikukfgulgmku0iss2/19453415684.pdfIn PDF document text
    • http://360global.ca/userfiles/file/donofikavegivut.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/39033468324.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0023932001630616998.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/48281811078.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/jasokubusek.pdfIn PDF document text
    • https://businesslife.com/content/files/rulimeluxovufixebapumobuw.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139630072a64---pazanixesazo.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/32279951396.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/digun.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/lalesokafarabopebu.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b92bee010---54191092491.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/44965683984.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210914040542.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/6092331875.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_off0000beff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFF 10508 bytes
SHA-256: 380025bd889535324ea291208700c7ea08344ed94905fe41a4a5adaf76de0c3f
font_01_sfnt_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 17916 bytes
SHA-256: 403cb949b9ecd3cefdde9467ffd22656b9f096b3da82d22cb9e1a875b20cd77c

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