Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4b63785f1ef6f6…

MALICIOUS

PDF

89.6 KB Created: 2021-08-16 21:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c1f3af09341512b71235defad5a0deb SHA-1: 9cc87f71c2a6be289e1cb89512438dbc21c8e126 SHA-256: 2b4b63785f1ef6f6c7278ebbe5a43f628e7db08cae5228f18bbc3b432b145f74
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains JavaScript actions and numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no specific family is identifiable, the techniques suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://citra.cl/userfiles/file/revobezaj.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/t1b74eum611o392i4hu6objq34/xiraleleleki.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/f01c9f5d0a73e62dfc0dc6684dbb548f/felasolezediwevaf.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ec8adcc75---gapituw.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/rupifogagovapopowonela.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/bexusovupezet.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/450a8db9da6a7d04f697a0f5fe400327/sibuxuxepiwugijesiluf.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a873ae4509725effb7da73e80f199108/gutenaguvalume.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vk8f8hsnjqc14prfr4ct8s2amv/pufunutuxuzupezajojukenak.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/95061353441.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/pepasam.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a50af1a1f---fukiposizuvozex.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/1ac67966c536306aeb0e6200aa79abad/vajejipu.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/61701005734.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/fusazisixuwuto.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161132fb6a0839---mosujuwadajabixekofa.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491bb6d066---90448802748.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/momeladiridanizubi.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/lasonujawawiwaju.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7fe6edf7f20aceb60911b4291bb28bb2/pinukimokelewetigutekoko.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/ruxuzik.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3ac786ea3b51f559ae71b562475c5907/saxoxosiledupor.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/tuxixuwo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071683fe2fec---57400863378.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=exercices+sur+la+nominalisation+des+verbes+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_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 19772 bytes
SHA-256: 82a795ed674c9a29c85eed0ae3c395468d1bf2726e6fc778bc15a376716653ae
font_01_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 11172 bytes
SHA-256: 7fe8dd8a2eceb943678e756294a171a25cd02af24957a3988042b5274655a94a
font_02_sfnt_off00013d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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