Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6468ceb8f0eec7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 21:21:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43ef8bb167601816906a37a24fa7965d SHA-1: 652da8189806649a6d606cc91d04e3eab100beb9 SHA-256: ab6468ceb8f0eec7a7b307cef9a6c4cd78d3fa3ed7393a2d67e9cd09e5292eac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to PDF files hosted on compromised WordPress sites. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/i77h3aa0n6bi491eqa1gr0dctd/96165625815.pdf
    • http://bannhuaduong.net/upload/files/64654072587.pdf
    • http://beiwendq.com/userfiles/file/9559200886.pdf
    • https://korovin.org/site/img_ufiles/tomoxifunu.pdf
    • http://nikolabartakova.cz/files/file/zenapa.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a19ecd4b11---kajazeke.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/680ma56vqeolsqjd45kv8hvfgi/37658763712.pdf
    • http://soncongnghiepjotun.com/media/ftp/file/14812353221.pdf
    • http://sure2trips.com/bot/ckfinder/uf/files/zokijasu.pdf
    • https://gea99.com/ckfinder/userfiles/files/lifido.pdf
    • https://thucphamtruongxanh.com/Upload/files/52159822054.pdf
    • http://cnc-soustruzeni.cz/files/file/49163945533.pdf
    • http://versobrokers.eu/userfiles/files/wirojuvadutazegoje.pdf
    • http://elisa5888.com/shopadmin/upload/files/6367824945.pdf
    • http://pes.edu.mn/ckfinder/userfiles/files/45682072881.pdf
    • http://suliaox.com/v15/Upload/file/202199135405865.pdf
    • https://lawrenceyezersky.com/userfiles/file/gisel.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f25a853e57---rubopabukuxuzulaxi.pdf
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/7468310324.pdf
    • https://idd.no/ckfinder/userfiles/files/38831020129.pdf
    • https://idroilektriki.gr/files/file/80660926508.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/jukupagul.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b88da9785---xolujak.pdf
    • http://border-collie.ru/sites/default/files/file/zitaputedisoxazezekenix.pdf
    • https://footballsod.com/images/ck-uploads/files/bumiburejidonavubelazo.pdf
    • https://www.casestilistas.es/ckfinder/userfiles/files/31704628472.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=mod+game+higgs+domino
    • 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_off0000b3ad.bin
1ff1825d9effd70999ec3f3d7a5dc8a681fa493e78fb0c321258e2f99c206d03
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 17920 bytes
font_01_sfnt_off0000e15e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16792 bytes
font_02_sfnt_off0000f975.bin
8f9ba0a49aa37a5977acc3eb8a6b97a6ac2d8d6ad743f91eb4a248cdefd02a35
pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 10444 bytes