Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88ebdb59a4dedb2…

MALICIOUS

PDF

161.6 KB Created: 2021-07-22 22:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9c5dd8c25e63fd080a4348e7d79c2972 SHA-1: 9cd22ba13a8c4c06af23aa58af67a9f8e42104db SHA-256: c88ebdb59a4dedb214f41b7a78fd0abd03cc1a7395092e606a01dbe4b0b9ad8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ebb793cecd4f9d54263c8686d059366f/90367792540.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980bcc819fc---fugozulilufafazonad.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/24452457443.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/6t7emeseg8iku38p6tc0v6f45h/nesugironabexalebe.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/67893909363.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e11184d87c---28414541525.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/32528079255.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a379c0d00---41325777517.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdd0f4123e---81664959900.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/82073588885.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/midonaduruzarewakibu.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/37426004989.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/divareditakelavesepowi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bed72bab77---bawadimivariximigijulaxu.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c204a12eb1---22140064932.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160cec93f482b1---laruxudujevadoxemipab.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/menilak.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/75824134168.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/40d7fe325414d86db3e2972302379e1c/fazujerajinikegofomagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=neil+armstrong+kidsPDF 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_off0002194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2194E 18012 bytes
SHA-256: 9f28b916315cef066b84d16b08a250c42f4ca29fabbd670ac9efe17082b15b2b
font_01_sfnt_off0002489a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2489A 10660 bytes
SHA-256: 415aab345ca2c24d97c0df01dabe08fecea76b30a356a06a45efddd58b0cd70a
font_02_sfnt_off000260cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x260CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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