Malicious PDF — malware analysis report

Static analysis result for SHA-256 3719230790bf4faa…

MALICIOUS

PDF

72.7 KB Created: 2021-06-26 02:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3fa30ec65689e2e164eb0ba4309fefe6 SHA-1: 7ed01cd0a9cc5e93426997ab3eb47eca60a82138 SHA-256: 3719230790bf4faad3b1c0297332562b8ec36a29c98e9e1288539dd3752dd9a9
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, forming a link farm. These links likely serve as redirects to malicious destinations, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a8e385bd---57489359824.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa57441be---9984500584.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/d3a3f98ib4fo1431n1et28kfo1/40099095563.pdf
    • https://astek-telem.fr/userfiles/file/29510292547.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad5d38698---xajuv.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kk52lj268ouui6v0boe4srhkns/12934273648.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b75021a0---56613073990.pdf
    • https://detectiveoffice.net/userfiles/file/84594579175.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f83af54a43dfaec1b19d71ffeda03562/liwoxipaku.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b405abe0---rawukipuduw.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d455b085c---wokono.pdf
    • https://bkht.vn/userfiles/file/96760886582.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c7bde7f34---98255148744.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a315f45a8951cc4a7af9260089a02e96/46104095348.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdda03ff73---fosoguza.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ikk8679fkg77e882osepepehk2/sujirasapuvibazanufatuva.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/90214e7348c617610af8b789bf72fb74/kisevesode.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/06f7506b8acb2c9e143db0fbc89e2c4f/rimut.pdf
    • http://train-in-japan.com/images/blog//file/31236872790.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/6142edd96985863138696e5756b1a48f/44498364288.pdf
    • http://sjar-tech.com/uploadfile/file///2021051622451939.pdf
    • http://alnoorcity.com/userfiles/file/xerokum.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/df4e46a0f7e16d76fe00eda245b4a1ff/pefagufi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=bow+wow+tickets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8d4.bin
e89c5f8340a3153b9088f22e6bd613dc164af1a2edc760385ecd7ad995a7f1aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D4 17040 bytes
font_01_sfnt_off0000e5a8.bin
5404e37b0ee301c3fc51543272e5e1d670a1b1dd045c0e9024267e19836dd777
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A8 10040 bytes
font_02_sfnt_off0000fc3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 16792 bytes