Malicious PDF — malware analysis report

Static analysis result for SHA-256 690874475e516e44…

MALICIOUS

PDF

81.7 KB Created: 2021-07-06 11:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd9b947a3aebe56e04449471873caefb SHA-1: 939f4d63d5192e7953eaf55033146bb6e60ec7a4 SHA-256: 690874475e516e4451fd9c0fcce5c48f624d44d8102fac2147a52a3e384bd688
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and potentially malicious content hosted on disposable domains. The presence of external URIs and links to IP addresses suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medvor.ru/uplcv?utm_term=there+is+wisdom+of+the+head+and+wisdom+of+the+heart
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a41674ec5---24985112907.pdf
    • http://i-daa-wl.de/userfiles/zekabedazelariwut.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81422e6c5---3409183681.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9f72aae8e63a012bab1c7a790b740d3e/podetewor.pdf
    • https://dolupin.com/calisma2/files/uploads/kosefitoxul.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f199ee897---tezamosetipikowikiso.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da76077dfb---futunuzojolefesonan.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a05663dc110---69509495950.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3351ebf41---42384317990.pdf
    • https://sca-kc.org/scauserfiles/files/62781357580.pdf
    • http://geologicatoscana.eu/userfiles/files/remiwukupegowuna.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160854e5def2b9---zodozuvatapugato.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a026a7f1f88---18029196606.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089789ca6247---pefuzukujosilu.pdf
    • https://autosaloncenter.com/uploads/file/11401411025.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c293816866f---lufaxejopedufexemiwivizis.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/5264262394f1a0e45e438a5cfd778c59/68534688282.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/49ed6bb9b1e066c35072107742807bc1/10674123250.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b122e7268---43903522367.pdf
    • http://peaceinsrilanka.lk/userfiles/file/97480674625.pdf
    • https://searchlink.org/userfiles//file/28528701635.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b206b290815---43519577266.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/nidefozod.pdf
    • http://daedukgs.com/admin/fckeditor/data/file/20210621052302.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_off0000da67.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 16792 bytes
font_01_sfnt_off0000f27e.bin
b5b4696519da6d92a93e323dd25cedce351f156856ac7c530d95fa110ca354f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 10624 bytes
font_02_sfnt_off00010ab4.bin
e029d6a35df1ed16146666a6259109f3e33538bac39458cc4fd5410ecd7122e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB4 17216 bytes