Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0521bae4cf6f0ad…

MALICIOUS

PDF

75.0 KB Created: 2021-08-11 02:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a8c52ad7cef9497f319b98ff0f20e16d SHA-1: 7f0a140310cd5a3db67a63f188d4725ef8bbb5f1 SHA-256: c0521bae4cf6f0ad64a1a99189ad3f321ca2847ee340957d7f3d81b5cd5fc1a4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier strongly indicates maliciousness. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate the download or execution of additional payloads from the identified URLs.

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.
  • 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://mdknoodles.co/uploads/files/2533691344.pdf In PDF document text
    • http://tsutae-f.com/js/upload/files/wesivotixun.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd10e682e---43040470547.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160becc56bd1f3---mezupanakajonema.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/69055710275.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d8ce7c945---63711741849.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7c1408cf---7364554124.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/67894735.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608325369bf3e---34788896209.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/xuzatagibil.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f86b3d1c555---64210997890.pdfIn PDF document text
    • http://beiks.info/public/file/33557543893.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26d7a4cde8---94394406937.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/kilujeb.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/wesobenuzunigibaref.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/xelulixubopuzagogigupuvuj.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/dejob.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/48077869751.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/xajaweboronaretomi.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19e44dd88f---53858296892.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/kmcmddnuaag0frr8tn8ar4tdm3/tinureti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dividing+rational+numbers+word+problems+worksheetPDF 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_off0000c022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC022 11324 bytes
SHA-256: 73dc8e5dd0035c32c679b698161ecc5494c4ebe62b035379fe0fe7f6245a1bbc
font_01_sfnt_off0000da37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF249 16832 bytes
SHA-256: 90d0c1579d6d0e97c8afce6374ab045feaa1150b596c32f4eac2af22daeb268b

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