Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ff7b2cdca98da6…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 06:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a08246b4a2971eb2e858800438f198bb SHA-1: a670ca8be5e04db8cf96d4d4225b2ab1785f4287 SHA-256: 41ff7b2cdca98da6ca427b331a85b471484345f55cee0527b8f41b991c232ef5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The primary purpose appears to be SEO manipulation or distributing malicious content through these numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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.
  • 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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dc2f86cd88e6637ce658fd2aa1954207/tepedixojolusaz.pdf In PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/97954147639.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/21578602942.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dl2tegqjbnjr5l6la8rvelcgnq/jarutupujapowobekakesulup.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fa40f7b34c6d18578e430e75154e9c22/13907409604.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/0aeca1dcf74bbc2e11694e3284587a21/93916708813.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11ee09853---jojunijudun.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e66bd7cedf---59043057240.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/b24lj4jvvj41g3im6i0gchnubr/39649709730.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5809421e440e91c46d8d9c1501296296/gofagonawigok.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/godeguruberalise.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/zanibaworevulemewapiri.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fb54a009e10---vizaludizadu.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d18c5183ce---6826279085.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/8253ba944f8d4eb111b305673611ca4b/fatuvodizesav.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/ea02526fe34afca8bc2d007b08d7483f/29476811415.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d726e9b874e5c9311bf4bd460f6ee3b9/71370559652.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/20427514907.pdfIn PDF document text
    • https://best-label.com/upload/files/62654977858.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fe664c8c2bb4ed028f22fff3b8e9f052/jugifobifiguwudelom.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63f862cbd799a3757bd653b0aad01e73/renizotatefetitu.pdfIn PDF document text
    • http://htygroup.com/upload/files/16815748353.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/wokemifedovinojewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=different+systems+of+the+human+bodyPDF 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_off0000c392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 10928 bytes
SHA-256: 37718fbac8b1a7dab7d5e9f5b1fec421579c4fa55270afa93b23ac643f9fa36e
font_02_sfnt_off0000f4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CE 16236 bytes
SHA-256: 71b7e8da5eeec37e0693fb15247dad67c8cfec22658498eb0b3c505daec81cb8

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