Malicious PDF — malware analysis report

Static analysis result for SHA-256 3169371cd198a861…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 13:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c310ebdab72cd5def7e2beae8637f03e SHA-1: 13c5672ae4b6588550a15d45157d1178d2f86191 SHA-256: 3169371cd198a86182539fc9f6919563f1e1d8170424cc996e2431d2b2cce6cd
96 Risk Score

Malware Insights

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

This PDF file was flagged by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm on disposable hosting. The primary function seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://sharadsangam.org/UserFilesTwo/file/96289440132.pdf In PDF document text
    • http://f-okinawa.com/img/tmp/files/toravevu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee27946ca4d---25368173368.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xunomuzojedebas.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/zirigamebitozilijelibuzu.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/38351536471.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8009471dcff15fec0769de6d998160d1/1739889771.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/72712374690.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f40ae110107---98036297618.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/8769707571.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/pejagofog.pdfIn PDF document text
    • https://360mart.net/uploads/files/wunebarotevetodu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160718b11e3d04---54963926263.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3302517a1d4167a4bfd362494c5cba25/gapipume.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4c64a030---93108587609.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1f4ecc1c7ec16b39379961932b572595/10028320671.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0597bdb354d019c1332110183510d307/tapugitunuw.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/65022515779.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dekanineli.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/zezagelevekij.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/qs33nsdp78231l8kgbc35kasd6/53293401732.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/fifiruk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=miliaria+cristalina+tratamiento+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_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 10772 bytes
SHA-256: c0e5e1e5aa4ae44341d29d634a62bdc85ecbdef848929984d069aa44ae02ee5c
font_01_sfnt_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 15968 bytes
SHA-256: ac0252656ad72a0e6a62c630fcbf7d2e8784ab5bdbbecf5d478110fd96ddcf2c
font_02_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1