Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3dc6327e827897…

MALICIOUS

PDF

75.7 KB Created: 2021-09-13 12:23:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 36a70dcdd95ddd74fe3d33ad8107f24e SHA-1: 67bf10fb5033d67e6acb177f4318383fcb751f5f SHA-256: ac3dc6327e8278974511c4c79dfd203d04d09cee1c294c8dc4884f959af540be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage. The embedded URLs, such as http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328119e1442---40595857174.pdf, are likely used to host or redirect to malicious content. The presence of PDF-specific heuristics suggests an attempt to exploit PDF viewers or deliver malicious content through the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613541fabe1f8---4082486807.pdf In PDF document text
    • http://pevak.info/UserFiles/File/62414568775.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/rekofifusalutasufonot.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/62441834926.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161328119e1442---40595857174.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/73193371766.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/26760205297.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/ranevajutanegigirivu.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/lebebilokufiwa.pdfIn PDF document text
    • https://geniodelweb.com/file/naloselujadewinar.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/febox.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/33122965893.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/53865731252.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/55147432369.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/pebaroputilunimisopidu.pdfIn PDF document text
    • http://www.centralperdana.com/file/bapomobojamasige.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cf424243d---xetudujolosujejuwelo.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/93897506221.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210906144945477896.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2o0qlg4f89b5gpis879mnap4ei/88336168235.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/98260591749.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/78831720700.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/mukegaropurituf.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613b03b7b688c---juzixaxelagilumel.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/85946401599.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/16519260024.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/vazew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=my+phone+passwordPDF 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_off0000c26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC26B 10448 bytes
SHA-256: 1558438fae92d60fb06be7afb17aec791a441d98a557daabf852e0f75443505f
font_01_sfnt_off0000da1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1B 18416 bytes
SHA-256: 9b874470ef2caa088685f779f4240fc968c0781b0582f96aac9505a776ae4c60
font_02_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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