Malicious PDF — malware analysis report

Static analysis result for SHA-256 0334898f8def0f64…

MALICIOUS

PDF

94.0 KB Created: 2021-09-04 10:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 387f8fbbe1adebc8116555c3d7ee7f62 SHA-1: 7a97bf93f17473088fcc55cab88887ee03ef0997 SHA-256: 0334898f8def0f64192c751e33db4b9a79113427bcd095f1872b6a5c4c0eab18
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs suggest an attempt to direct users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=ethnobotanical+study+of+medicinal+plants+in+ethiopia+pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160712f8c4c2f8---ruvomasaxuposezesazupobe.pdf
    • http://macautemple.com/userfiles/file/69265570250.pdf
    • http://handbook.hu/upload/page/file/50394618140.pdf
    • https://waelfawzy.com/userfiles/file/
    • http://greenbrier101.com/userimages/12129766477.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/nugego.pdf
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/51339084577.pdf
    • http://n-production.com/upload/fckeditor/file/17246189712.pdf
    • http://www.kickcommerce.com/userfiles/file/32499907308.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/t5ir3fo5aa8nt497k0f9ufovk2/57268776906.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9748fc9b---66872917784.pdf
    • http://verynailscm.com/user_img/file/nupezategomilajurej.pdf
    • http://limobebe.com/userfiles/files/sazokutiz.pdf
    • https://iwistw.com/upload/files/jekisazituludufutumuzemu.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a92b1d9209---69034800921.pdf
    • http://dunakeszi.varosom.hu/userfiles/files/giledibitesufoto.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e71c1b59b2052aa860e29f7230e3384/ritijotonususufabozada.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/sovenu.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4043170c81c1fd676e51e4c44c702095/kopofewu.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/bf04e320a407c739a701afd0cf5a47a6/tirebazama.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609421bae827a---xitukogebozulo.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/45275741864.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7ltmlprerksn8sl5gl6sh8jnf2/29577073029.pdf
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ul47t1mji0nsonb03ebsp1oaa5/73063521907.pdf
    • 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_off000107e4.bin
bdc673f50dbfa169b7004b447eb0fa2dda5b0e9ce82b14374138c939bcd6f0e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 18304 bytes
font_01_sfnt_off0001380d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1380D 16792 bytes
font_02_sfnt_off00015024.bin
3e9c94ba00c23e8834a0e052090a634b878455cbf40f9e6776a0c58600d7cf5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15024 11124 bytes