Malicious PDF — malware analysis report

Static analysis result for SHA-256 82cfa725c560fab1…

MALICIOUS

PDF

85.0 KB Created: 2021-07-06 21:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 01f27920bdcabb37793fa3a039b74ee4 SHA-1: 366dfc93933323c4cc633293ed1fd2c71c103f2b SHA-256: 82cfa725c560fab1e5b4de28621466b309a6fa3dc13dacfb79c1e7a742af419e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://adaviestransportltd.com/userfiles/file/fovekevuweroj.pdf In PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/duziruwebovaxo.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d79a9e783047ffb654317cf99ea93089/dalopinezobumejimufo.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/fusibavinebobafida.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/fuwiluxijenakojamemo.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/85ef6b9b2f6bf594e728405935f2dc96/luvofisibobebulo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/412028592c102b1dcf45e0cf918921d9/bojozuzogofe.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/44418540012.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/3442303571.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/joranerejitevagulowivonu.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/4691299548.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/62191509750.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a98457b9---sogefazuguzef.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085afcca223d---5841604386.pdfIn PDF document text
    • https://songhong.info/userfiles/file/makaw.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c88224afea9---21118826148.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/40317744285.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/jejazebotelepejuxuxul.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/62895042287.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/dizexugufelexememo.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24c0e3e450---85630208054.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d3196177e---25076107358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=apa+chapter+of+bookPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 17364 bytes
SHA-256: 079025db4e5db5e27dc159818ebbe92be5962078307f82f49f5d17dcec140e8c
font_01_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 10380 bytes
SHA-256: 162203f3e19fa69ee3f585a72006ebb38d93f64ffc11091539fdd48803791890
font_02_sfnt_off00012f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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