Malicious PDF — malware analysis report

Static analysis result for SHA-256 95adb88e2a5c4f5b…

MALICIOUS

PDF

88.0 KB Created: 2021-09-19 01:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34aef0f6087409e619159c755be46c10 SHA-1: dad22e3e491cd074b33b17b8ba87243e30d35d7d SHA-256: 95adb88e2a5c4f5b4c91613d6f4b45cc4276c726cca46cf5b85dd56c9f674957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to external sites, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://queure.ru/uplcv?utm_term=android+music+streaming+app+source+code
    • http://greece-ex.com/images/blog/file/24902347153.pdf
    • https://bushregenerators.info/userfiles/files/xowufubome.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/14151003951.pdf
    • http://gzmzwl.com/Uploadfiles/files/99628066168.pdf
    • https://halead.com/uploadfile/1631434213.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161332ce6c26fc---sisagoboge.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f45bd0cd70---52939215622.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b01043f0b---fituwalojonodudipemopef.pdf
    • https://pointwebhost.com/calisma2/files/uploads/molovelofeliwisokugu.pdf
    • http://temdientu.vn/images/ckeditor/files/38422688931.pdf
    • https://www.sacict.or.th/ckfinder/userfiles/files/nawuza.pdf
    • http://sarkar.ie/userfiles/file/jirodobaturigidafilimar.pdf
    • http://hangquangauto.com/files/ladumezixaze.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fc44e25159ecc2d8bf77c0a104c4c9ee/408167348.pdf
    • https://sieuthimaytinhcu.vn/upload/files/vupizoromexunedetukujez.pdf
    • http://asude.istanbul/ck_images/files/zurelakijekal.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7b0ed5dd86b4136d648de08d8db0d09f/renurorimuruxeperuk.pdf
    • https://medarbindia.org/ckfinder/userfiles/files/50565329696.pdf
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/duxuvotipupofogo.pdf
    • https://vantainoidia.vn/ci/userfiles/files/95396606557.pdf
    • http://faurau.com/luodan/images/userfiles/file/tibuxilemurigaratazafilek.pdf
    • https://faresaldabbous.com/uploads/files/sopufuzadefibobaxu.pdf
    • https://daqing-jewelry.com/uploads/files/202108311745497689.pdf
    • http://mydreamtuscanwedding.com/editor_up/72914829190.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/regefvhrsksg2j7a7cbnrgjnl7/36119220589.pdf
    • http://poddertradingandindustries.com/userfiles/file/jatumavokofekabakamoxenez.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161439fed609c5---nakaxujeveporajokikako.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_off0000f39c.bin
428f1946fbc2d0f25fb65e0e2204149cf574e86e589ba94be4d3abd2b1de0d66
pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 10892 bytes
font_01_sfnt_off00010ca5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 16792 bytes
font_02_sfnt_off000124b7.bin
fe963d51106666d7ecbb0dfeb7f077bf00a172e6846c93f6b4af3302b0e9962a
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 17472 bytes