Malicious PDF — malware analysis report

Static analysis result for SHA-256 7389ed5e9684cd0f…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 04:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 194239a25e65224e0b61fa471d79739f SHA-1: fe850a4976103518ca3b5420afa3d76dd84e0079 SHA-256: 7389ed5e9684cd0f2b83f770440b5ff28412d1eea8bd8427c56931a9aa01ec6c
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ohappy.org/userData/board/file/78923153123.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba932aeefc4---96688675833.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d584f50722---13722715423.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/23726242081.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ol4kjs070c1oanegukk2dkq45v/tafivuduk.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/01mvfh1md1mf08r9q9lso7emna/32198545779.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/debijox.pdf
    • https://nasikampung.info/contents//files/bubokufisijives.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/lebawaxoraxopujekonubodas.pdf
    • https://naoshima-habitant.com/woxokaxebiwadifukubot.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e1ffc6c415070af858d4868966fa0521/78713160914.pdf
    • https://dolmalatrek.com/userfiles/file/3422599497.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/65b7bcea5c6d7a2fd0dd3be317609046/derobitureram.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4c120e4e6---vevetefa.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b45ec01e219a7c4739e1d27256a0ae70/6365101532.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb1cda7e26---28586106426.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16095cb6a54aff---popomef.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec1e539d887ee13012a138c3f20bb345/noxojawebogomibogutixinil.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815e68119ee---roxog.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ddc79791e2bacbde6809e45b6b502bfa/xezudebinolafakisoxi.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/44a738769fd6c81e95a8404106f95658/lozuzutel.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/79804819558.pdf
    • https://hgb.se/filer/file/46177426541.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079055ea8995---36088065370.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=famous+fairy+tales+characters
    • 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_off0000fe2d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 16792 bytes
font_01_sfnt_off0001163f.bin
37d486540d4c19a23b67791856a83f01517cd97691619c07dd95d9972b9af357
pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 17184 bytes
font_02_sfnt_off00014314.bin
3d34338b4522ad1b2f6bbc6d7a15688cceb2994c55129800c31f4ec0d3e775b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14314 10688 bytes