Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58adbe3199ddd85…

MALICIOUS

PDF

97.9 KB Created: 2021-09-07 02:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 8b88c5cf5071715cedc57051f751d2a4 SHA-1: 851c5853bee48b3b86b7e0e1018cded1f51a79b6 SHA-256: d58adbe3199ddd85974f0be11c516a9e8e6f250e871916ebb8579e9d78d171b7
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress upload directories and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common distribution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://irlanc.ru/uplcv?utm_term=new+headway+pre+intermediate+4th+edition+tests+pdf PDF link annotation
    • http://sevinctekstil.com/resimler/files/91798412617.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610608b50987d---22287581806.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6001a6c057---40574940572.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161107e56b2a9b---4836410775.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/50752480205.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/21/66147445196.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc52215576---48431313731.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dda7b7d7c2---mofakixol.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/92122356659.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/sksbjrlguivjeht82s4purk1s0/dekitositedataluneke.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb79358bf2---lalilazanutugalivu.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/tirojep.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610074975d324---10234572032.pdfIn PDF document text
    • https://kaparatt.com/images/File/94678856347.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/1cba478c2ec84e2e80cae341fa35ee52/senuvewezikujopitebozes.pdfIn PDF document text
    • https://noddy.nu/images/file/pobepirojop.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/f5a2la0javjbmdlhmtdr3p13ud/vikapafinamalejiti.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/99a29dae94c12efefae6b4b97044ec80/sebeto.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/jujitujenulinijemu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/71018374577.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e4b3b61a---ponitigaxedipifugapozos.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/29671070748.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/486318b94813858b6c332d7ca290465b/16094887563.pdfIn PDF document text
    • http://sartor.ru/upload/files/87089160173.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/abaa253095f23ed91927fd9974137af8/sopetogixoxo.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/35533025637.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 10972 bytes
SHA-256: 183a4a644e8725e52e775c39dbc725e4caef48fea332684919227db0f64b5146
font_01_sfnt_off00012d3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3B 19616 bytes
SHA-256: 9eb7c7097c73ab071f0350e18dea9f3a5d02d2b430892a65b5630f6d7650f880
font_02_sfnt_off0001611e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1611E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1