Malicious PDF — malware analysis report

Static analysis result for SHA-256 d341908fba561920…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 00:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82c0ed93a00a88d78acd3c4f0a875b32 SHA-1: 42c9b3f5c8959d2296ee0fc0057fb67553595be8 SHA-256: d341908fba5619203955e76b85fbcc0b8b5bac8ce6ef5d8e645d2be10579d43c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, directing users to numerous compromised websites. The presence of multiple PDF link farm heuristics and a high ML score indicate a malicious intent to redirect users to potentially harmful content. While no scripts were directly extracted, the document's structure and embedded URLs strongly suggest it's part of a phishing or malware distribution chain, likely initiated via spearphishing.

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 https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/531b525e28acc64fabb02a2cde126e58/80777787871.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf0d0ebc0---kuzumumadaxotanufa.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f476dd2e4---30801417776.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a204093a5---35851739070.pdf
    • http://tamlaproject.com/userData/board/file/pitewig.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/294bf7abef1e77d4af40a725dd08835b/konopisib.pdf
    • http://rainbowcaterers.in/userfiles/file/gekeve.pdf
    • http://vo23.ru/upload/file/wedevu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/o5jefpj9bn4a2au13ov3e3a054/6806949101.pdf
    • http://ghalemdi.com/userfiles/file/zimiduzetavakowavixibafeb.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4747a3dd8---26855397521.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609506466cf23---82369331764.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/9752207965.pdf
    • http://tpdw.pl/userfiles/file/91362941370.pdf
    • http://waypl.pl/upload/File/jisaxajevow.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a09bf395948704d4414ff06345ae7a3d/nirovuru.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8883183940c78803e868b37995f32f6d/84066131966.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ca1925b1---xokev.pdf
    • http://piazzademarini3ge.com/userfiles/files/barasosakijejon.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a108786d00f---jidetejiwal.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2lq1npo720lrjd3tmrk7rifn25/97679495944.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6cdd07670897f2cb3a2dc788b29e2134/46258528960.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a85bc097c12---44849613525.pdf
    • http://a1-automotivegroup.com/upload/files/97358099535.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/8d2248c13bccfce166975870486cd336/tinosurukuvig.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=what+to+eat+when+you+feel+nausea
    • 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_off0000f430.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF430 16792 bytes
font_01_sfnt_off00010c47.bin
a5909e1b13759498d8b49104f994ef104f7a816f9e6c424aedca2b66427aa462
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 10412 bytes
font_02_sfnt_off000123ee.bin
9176825670bfe892ff21afaaa5762b4484c7d505bcdaa601129a6f174acc85c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123EE 16852 bytes