Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be210771bd609ee…

MALICIOUS

PDF

90.1 KB Created: 2021-07-19 17:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 74237ef464f5f9df1b9c0292b2e10da7 SHA-1: a0902e39b29d24b8d9f864083b992786aef7b5ad SHA-256: 3be210771bd609eea610a659f668f77fc481b02d7616ae0f53f56479c6ed0cc9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/17jj40su4vdrergumh5696np89/12233324254.pdf
    • http://asbufestival.com/uploads/FCK_files/file/gomerofosa.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/f45afc996674eb3bb0f017616f0199f8/xisole.pdf
    • http://omni-links.com/94214688154.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/viredekukojimewezezudof.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/rivirisemewujat.pdf
    • https://kovosluzba-praha.cz/res/file/99025866524.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083d75767f1e---32862049978.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a33ce7dff9---meledejoke.pdf
    • https://slide-bearing.com/d/files/doxamesidudijemoj.pdf
    • https://mfdesign.hu/files/file/83363741088.pdf
    • https://doanhnghiepvietnam.org/img_duhoc/files/70769360941.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/vup0b687un9551ld95v0oim724/41891788097.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f06e198926e---37902857586.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a956076964---wipomufubazojototi.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608606c48a48f---josopujot.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/ohk8tsllnlg666jfq00396f3pl/40785618036.pdf
    • http://zajazd-broadway.pl/galeria/file/4307494799.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/ad3f7ebdb5bdd77d707a716e98814fef/31062917598.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949180b5d6d---samotozije.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/5f0a0dcefc283528ba0fa10cddb19a73/fijiwegikepa.pdf
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/66567231232.pdf
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/5073023387.pdf
    • http://bobiniauto.com/userfiles/file/90896631751.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=disease+caused+by+bacteriophage
    • 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_off0000fb56.bin
87b2678b181422ad7e5bb4c883eb8a3f36f3ffb375e198c0ba43bf48285abd01
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 11000 bytes
font_01_sfnt_off000114ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
font_02_sfnt_off00012cbf.bin
ab395592f944f6aaa777293aabf6803c38a990bfa7fca058b52ea70ebe79776e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 17280 bytes