Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e60c2904a3c0b2a…

MALICIOUS

PDF

79.8 KB Created: 2021-08-20 19:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3fac20e2dcb4ac5cd53d8dab79a44a02 SHA-1: 107a5f74575e90a427b5e6005460428ff6bb2670 SHA-256: 3e60c2904a3c0b2a318c34050520f1674e025853d658f4b3dc491007545749ee
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress uploads and disposable hosting, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings suggest it is designed to redirect users to potentially harmful external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=ejemplos+de+energia+cinetica+rotacional+en+la+vida+cotidiana PDF link annotation
    • https://karapinarinsaat.net/userfiles/upload/file/belojonokefatewu.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210701_9509C217CC65C70F.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/r0p1tdbcd6ssk95gkvqdmeg6kj/sovizasesokalikapivo.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113e6096d756---96826440720.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/juperojodixuwimobikomomip.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/672057a47edffefffd07aa8ad40bc651/35128538642.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb62b9b261---japisina.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/51333161845.pdfIn PDF document text
    • http://thueotodn.com/uploads/image/files/tirogadubapofivimup.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/40cfa9bbaa7590f0e36507e599057c4b/ruwekejibuxabun.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108090750293607.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/a0012e45bf7259800a929768261344e6/turavofikovamenuseramuki.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077c55b7a365---9196002654.pdfIn PDF document text
    • http://marymo.ru/uploads/files/kosebutibozofefajetumo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6ab11d06---56320788350.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wokoduvowatafuzekigule.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/odj89a4iv4ug79nvj56uu1r504/88608606371.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca00b9e11---50699056920.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/suvidizojefiwib.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/jogul.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/gajana.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc204e32e5a---guwako.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/86cf63e55106532df723c36cc5bb742f/bevofesegunozok.pdfIn PDF document text
    • https://trieurodata.ro/images/file/12777998836.pdfIn PDF document text
    • 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_off0000d375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD375 11036 bytes
SHA-256: e0bcb71ce07349d5fc6bb3e0796f55d51b7ad1b33b2d0219864a276bcb28dac1
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16808 bytes
SHA-256: f64ba5e8477a9adaa2607c392284fd8ac5a4795b87690dcdfbe3af653a4008c0