Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9b25b23a82c8af…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 19:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34747b2696e35824329a521d179d1226 SHA-1: e68f8f32103b67f47b0ca1d1421de0b31486625a SHA-256: 7a9b25b23a82c8af6af4beea742bd12a3e7aef31df7ae749f002c8737d9b3558
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The presence of a link farm on disposable hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=best+pokemon+go+locations+to+spoof
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139886ce31---11574551619.pdf
    • https://alubiasdetolosa.com/files/galeria/files/vaginedub.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb89423b6c---gujexi.pdf
    • http://fskyok.com/uploadfile/files/molovexoje.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e7a3a1735e---75024931181.pdf
    • http://kite-surf.sk/files/gijopaxibapagut.pdf
    • http://daiichilogistics.com/uploads/news_file/60145392814.pdf
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/67978632053.pdf
    • http://jsushibrea.com/uploads/files/xebudixitolinanurazazu.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/25572401728.pdf
    • https://bodzlomu.com/userfiles/file/sixiwepawebawupajetizad.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161443432805ee---buzopiw.pdf
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/57712865967.pdf
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/rovaxa.pdf
    • http://fkm-lux.by/var/upload/file/genini.pdf
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/34484047651.pdf
    • http://bibliotekaludwin.pl/img/upload/files/xuberuvenaxat.pdf
    • http://sluchatka-shop.cz/files/upload/files/38923913871.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614697ac136fc---bigupoj.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/ff6b8933c8cfaea3fe3c5217c8006a3e/nejigunosopekikiritoji.pdf
    • http://sewakendragroup.com/userfiles/file/16311744032.pdf
    • http://dlastudenta.org/Upload/file/jebixasukoxeduxalekix.pdf
    • http://egitara.com/upfiles/files/5158261615.pdf
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xogizupaxososofobekixo.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_off0000b23b.bin
3e3fe144f29d36adaaccaa55feba04a7d64b42ba1f7285a3d2e55a36860e949e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 16260 bytes
font_01_sfnt_off0000db7e.bin
d9342ec89e9c8ec08f1ed7e1485f862637d9421f219662a2b07c074dbca1bce4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7E 10868 bytes
font_02_sfnt_off0000f4ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 16792 bytes