Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f6719b06d8ba24…

MALICIOUS

PDF

91.5 KB Created: 2021-07-01 11:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d9b6621ab82c3365159c0f36715c583 SHA-1: 16e90f55dc1bd2284ad63bee9a392980e6d81cda SHA-256: c8f6719b06d8ba2420903bf321005ebd1d2861395ceee28babe281bd34998085
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to websites that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to WordPress upload directories suggests an attempt to host malicious files or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abddf2729f---semejirorotivikatamuluvos.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/4367c9f9d7f41ee595542895632b75bf/84932077273.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc159bca36---15827159177.pdf
    • http://pusancard.com/userData/board/file/58277938660.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a149b1bdc7c---topazofuxakatiwaginiwupi.pdf
    • http://marthomaiticherukole.com/userfiles/file/pesavutesumeja.pdf
    • http://ackerviewguesthouse.com/userfiles/file/zumarozobuwadoxazupezigip.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f81f248c4f---45405631165.pdf
    • http://beerskiboot.com/img/upload/file/91163782782.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a93b144986ba14a83e63d180697be31d/budikudodivuzo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7508cbe117---23474920327.pdf
    • http://beiwendq.com//data/attachment/file/19027771452.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/57165864e1e36bd7ac459f1435d4a0fb/70048328081.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17ccc89cf0---689625423.pdf
    • http://kwong-cheong.com/userfiles/97715794679.pdf
    • http://fszhenjia.com/upfolder/e/files/20210528150554.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20a6b2bbc8---8969591615.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070eeeb0f853---xisupuwokebitonekuv.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/58386222896e99139b00e06163baf21a/68117099147.pdf
    • https://accuratesearch.com/userfiles/file/76979764850.pdf
    • http://studiotecnicolamanna.com/userfiles/files/delititewebidakoga.pdf
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/gobowopesokabas.pdf
    • http://gmkms.net/upfile_editor/2021/files/12008418927.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=explorations+an+introduction+to+astronomy+7th+edition+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_off0000fca1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 16792 bytes
font_01_sfnt_off000114b8.bin
fe5ff5c1cae9a7940b64a81e3a175233c81692341f52fa96ffdb1a314aa6faf1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114B8 11236 bytes
font_02_sfnt_off00012ef5.bin
41c3d1c861b4693d64b8ee47e63cb1a92a9d17786b45eee3c4544e9a34e38d11
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF5 18456 bytes