Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f1c71fd16b0b64…

MALICIOUS

PDF

87.7 KB Created: 2021-09-14 10:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: af731457c9a23d449ed5d30c88c49e31 SHA-1: 0abb1bbc96985439c9f50ce4adc6007d93df213b SHA-256: d3f1c71fd16b0b64f326eed1788f6d4ebe47f63d777616f305023cfd80239eab
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or use disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=one+piece+stampede+movie+english+dub PDF link annotation
    • https://goodluckfishing.com/ckfinder/userfiles/files/66213098610.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/78066087616.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/mugutalafijavasorafaf.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/60483745872.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/lekotana.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/mizevidotujevotunod.pdfIn PDF document text
    • http://elsped.hu/files/file/bexinelazejinitafodof.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/28806027177.pdfIn PDF document text
    • http://vakaruinzinerija.lt/userfiles/file/58459721754.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/26375173050.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/78a19a677484acc865335bbc564319c4/32806810383.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210910153444.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363e799a1e8---80041998056.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/98155914572.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/tolemew.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132e5806831d---62572201906.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/vunuxafusugivasaxozun.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/zaweniwokonoju.pdfIn PDF document text
    • http://herve-coiffure.ci/files/94492299960.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/jamipobewobebu.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/21263721581.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/funojaf.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/28532755039.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/kibimupemofonajojemasuv.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_off0000ed54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED54 19028 bytes
SHA-256: 0aab10baf7c071a96dbeb0e06c9a68069fc0290f3fa7d136203e9bc35e20558c
font_01_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13736 11192 bytes
SHA-256: 5d9ccf57e9ab28ba2548599f9a29d344929085fd6ca67894f551295bd4786c7d