Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a93bc6e1c8ff449…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 23:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: adae89ec9f96b81246a399779cdd1ce1 SHA-1: 056c1d8ecd504f85a83bad9f7acc102a8339ccdb SHA-256: 1a93bc6e1c8ff449941370fa20fe13d21ba0d167502eb14fedafd825074d2cbd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to distribute malicious content or phish credentials. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://pametnidom.hr/pametne_kuce/userfiles/file/xazadegesugolewub.pdf In PDF document text
    • https://windsbs.biz/files/file/susakuputesisuzizakisivux.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbd2b77d77---xafasozinomizajenogarapa.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7d75aeb6ea90a4696a2fff0b858f328b/16510381304.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/xamowososufabafaveremap.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/pamituparopuxisoxegeladus.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/75483537081.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h5jblm54ie40jlcg8bbu5gr8q2/nelizepok.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/57176990700.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b829019836---lepijetemo.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/06d29033cb3909c636c6c94bc7f2b344/tadujapusigosonuguru.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ceaf740f39b---52885730091.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e6693a2b3---getixiluwutiranemugize.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/80999912300.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/sj047cg7jm2e42hjh8g8vnmc7g/dikizem.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/zomexarekotagupip.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/junuriperudurexig.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/fagetaxofapeparuxejomu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae67c53c648---zulabe.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///12842803051.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c40089c7cb9---96575976887.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a38242499ccbef1692f01e4138f1af21/98611356507.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/dudapilixinokatitazowo.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/53080719582.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914dfe13df2---lekebuper.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=convert+picture+to+pdf+androidPDF 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_off0000d816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD816 17756 bytes
SHA-256: ad534eda8d6f625f75c71f6f37be3b1db339fe4de452a7bd74613797850c489b
font_01_sfnt_off00010598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 10596 bytes
SHA-256: 951c81386f64ff89375b219b31e9794ea6d604120f8baf99b95512efe487b618