Malicious PDF — malware analysis report

Static analysis result for SHA-256 d382116a28c3a4ae…

MALICIOUS

PDF

146.4 KB Created: 2021-09-03 15:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81c4a04ce69b0e0eebd485bc2554215d SHA-1: aa5ed2480c9fd2f7e473c3157c9d29e19ae0c89e SHA-256: d382116a28c3a4ae8e118e3323f3ab64b763d4b128d293630ffa653f4c20ba37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://aksukartela.com/images_upload/files/veluwozajadawoliso.pdf In PDF document text
    • http://sincaremedicaltour.com/js/upload/21818425859.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/62441811774.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090033e1acb7---64414706181.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/88384438016.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/70605634490.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ca68a7383ce9552808209aeac96a5983/bebugoduxopefozawoli.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/6233503606.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d932c88028---38929749103.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/pofozavuvekipo.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/323843785.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/95790876588.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/netenadixawe.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/90915017967.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/54118981196.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/e3db1a9126bb34ccef1ce0ee7551e87b/91447908504.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/1m1aqdke9f9sgb4q0b415n63i7/13754532256.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb145d6c6d---68112917815.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f191bd159---92478248659.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/jilejukebizado.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba16f250d3---11565481520.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/winaberi.pdfIn PDF document text
    • http://nature-revive.org/files/file/12378608773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=math+worksheets+grade+7+complex+fractionsPDF 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_off0001d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D68E 11388 bytes
SHA-256: b0e48020abb0b177296c8a1f7afd73d4a44a6bb53b6315fe33ea8207859bc125
font_01_sfnt_off0001f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F128 19356 bytes
SHA-256: bdb50679ac99eef05f3a5a18508aa441be6bfbd5997c7196b01d43af3e82c14e
font_02_sfnt_off0002239e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2239E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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