Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b17be32f681a8d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 07:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18e4d82087193b7b01ee0d0715b6d56c SHA-1: 2dfae6eb036aa3f2ed9e2242af3c1586f39c26cc SHA-256: a6b17be32f681a8d5193163cd41f01b8c49f6323f508d3a0b1c6cff3ccaf6fa1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, supporting these findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nordicaluminium.ru/userfiles/file/19152554754.pdf In PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/16437650014.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2b85c215---vuvelixerejoru.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/ditako.pdfIn PDF document text
    • http://renovator.cz/files/file/64225862069.pdfIn PDF document text
    • http://lemonsport.hu/upload/file/jilovilizo.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/55151740652.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/59292694271.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a952e0de02b---27644336463.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/72914757300.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sigawutavog.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb1fb1fd74---29604071102.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b1852b15573---tojuzijunisujitoj.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/cddf992c053e618f546b6c670efaeda9/78886717694.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/635728766.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/dadilobebutavogutinuziz.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/74544371375.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/t6b09d52fp9lukj5ghfnle7jk0/viger.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/49416289922.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/c14fa3aa3d46adf038c6db9486c0be37/91605963757.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612487107150f---bakun.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/18406458281.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/22540063900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=relationship+between+inflation+and+interest+rates+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_off0000c405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC405 17144 bytes
SHA-256: d73181d884a2a8e65bac153484be03e6a887048e7c82e56e51fec40fff83ad11
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C9 10868 bytes
SHA-256: 8e72c7f112c74133a661227a4f52d471d7994cc63010c282dbf718f1d974100b

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