Malicious PDF — malware analysis report

Static analysis result for SHA-256 506167af6d6edb4f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-01 14:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 370415714dbd3515b1767ff6fc277471 SHA-1: 1cb01ff6b3f4f6f6ac4b1fea2f4222f674330075 SHA-256: 506167af6d6edb4f7c8ef1629810e91dd01548bac007160417df6f7db9ce30c9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or engage in SEO abuse. The presence of multiple distinct hosts and a high number of links per host further supports this. No scripts were extracted, and the document body was unreadable, but the heuristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/js39969r6vm7js1qm4l4ln42nq/nusurilebupide.pdf In PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6833e8637---kilomurawikesuside.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b45584585---95794083517.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4487c0570---18599992541.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/c625hllaud52phvltse7ib0tlu/46257428785.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e0ba2a389---wokixebanejenesutelipi.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/6cbb92596057fa9293573d6a7c981a92/sokaxan.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ce64de5b---38459082944.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/wivulabemadiw.pdfIn PDF document text
    • http://ropesadventure.com/d/files/vajor.pdfIn PDF document text
    • https://animaliadielisa.com/file/budasegobekik.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/qij4ljrjfci9o0c85vatd10mi4/wanifazuxas.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/35ij0v73fdb27elrpkjnp0ndm7/sovoj.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609887ff581c7---bogubopiv.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f5e6c6f4fbb06ad6c0b6a156ac20d979/24571027746.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/dagosozadeditika.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/kakukepix.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/juaai5idbl2cgtj7d1lo0sjljp/pedivokodonogeruxoduji.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc1f68f6d---pufol.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10e43a115ebb3fe7a5350c2bfa7ce9e/66326077639.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/dbg2hffsap62drlhooqs8jfj05/13950969777.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba24740e2---duvuxaminosorew.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9a63ec44---banisuwebixafebabafug.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/vufamid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=answer+of+sample+paper+2021+class+10+englishPDF link annotation
    • 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_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 17544 bytes
SHA-256: 038733a73f94b57686e27a86c734e1da48790a49375ed1fb39aea1731a01e433
font_01_sfnt_off00011f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F86 11188 bytes
SHA-256: c40f553bbdb27e1c74d07d26530e1c47937d022541ff0395941d05d69efe3cb9
font_02_sfnt_off000139b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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