Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9aa04428e8c34b…

MALICIOUS

PDF

85.8 KB Created: 2021-07-28 06:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15660d3b85b5065f2fb2b5bc836fa321 SHA-1: 2fd9e37acd9439aa3935c0871b311e0fe110bbf8 SHA-256: be9aa04428e8c34baabc8ed457c2b9ce293260bd4283b18d9f7c646f3d48fe77
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The document body is unreadable, but the presence of many external URIs suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://modellszerviz.hu/userfiles/file/39060047590.pdf In PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16242000945996.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f784dab6767---sawesunitun.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/06odalfqbkeo525f3uba112ipj/letavamotefozuvapijo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/295f7bfd8933fae900d2f463c6ab97c9/72376142057.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/1oah6jbj9la8ieu5som03f7845/nelowi.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/mixesaxizutujanaxe.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/tipomawidimerixisipodagan.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/60740620267.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c54d09d46ca3294b24e89885b3cf6b0/bikubezutovedogafugutal.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608259181e251---14444314379.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0af83338a5---81597255601.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e243340393---menokajusirejegixo.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/namurezifuzuvifitevek.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d58f017f3---62450866311.pdfIn PDF document text
    • https://signika.pl/Upload/file/17848081591.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/gilij.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/15790864062.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-27/images/files/50792364923.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b7dc56638735a753a05c5c614c99ec41/jofulaloxejevegavo.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/dejitafumeboripune.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b2d8dbedac4c80c3a50d6eca0de34263/95087783858.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/c132f4f780bcf8585911b204a708c623/45148870835.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/n68uqvl5is9mfo1g95fnr62rm9/zovetupime.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f170895d7b3---fitojegunepamuri.pdfIn PDF document text
    • http://boldogelet.hu/media/xujetikiwokeridofoxanalid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=logic+pro+x+cracked+windowsPDF 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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 10780 bytes
SHA-256: d7fbd18a7757ce269e35888fbeb314b88b8dc1683be5589855f35397fb283afd
font_01_sfnt_off00010524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 17100 bytes
SHA-256: 3a53289b840ae5e7f9417a9c6d542dd6f6d23b366165dfb9b3237e47822f01cd