Malicious PDF — malware analysis report

Static analysis result for SHA-256 1134e0f680f8a13d…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 10:22:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ffff90ffae899e49f7c32739bfb011b SHA-1: f75fd69261c5863df5ced790e52c8c0067c0fe43 SHA-256: 1134e0f680f8a13d7bbd4249653c7c1ba4db992d30b694e9daf88ea48c1c4f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm that directs users to multiple compromised WordPress sites, likely to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The URLs extracted are the primary indicators of compromise, pointing to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf27edbd94---kimub.pdf In PDF document text
    • http://telekommarketing.com/firme_data/files/97185337241.pdfIn PDF document text
    • http://artside.org/data/temp/file/17194884211.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098b69a0ce2f---waponu.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/11220491173.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/126a6aedcfeea8a0c0dd221c974aba7d/vupaduvunolujamopuxu.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/a975fffd40403f28a47543c52fc280f1/rifazuzawosu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d19288b8---refijelatagulafapekageve.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/sawejelojijemevibenizexa.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/1077527411.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0e2065580074510f45ded1953a45e751/geriwifezakipagovawaj.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/77e9eef4840204ab28d91a5dcb2cdd86/larilesulofojenozugobuv.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/jozovirutamolijafezimag.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/67560396023.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/21944117745.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/57178160266.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a72b2ac8899b791859e34e37d7d8eaa2/91830722185.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e682b031f---japokajokuli.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/sijibuwizi.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zasitibizilogenavi.pdfIn PDF document text
    • http://qca.ch/userfiles/file/81255569155.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/dkar5f9nh3v2ksp980g6uvq3g1/jugimulijawofup.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/74911320634.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/9920912593.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/bekisejobisejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=lion+king+everything+the+light+touchesPDF 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_off0000c34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34E 10676 bytes
SHA-256: 056126012fb60fb9355e1d7d503584a3879c39ec89c2df482328cc857b1408af
font_01_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D7 17320 bytes
SHA-256: 8c454aa1b3b4b672ecd69f8ae4ec468a4245bf0f53ee759e91532e2554423822