Malicious PDF — malware analysis report

Static analysis result for SHA-256 61eee187e099ad00…

MALICIOUS

PDF

72.4 KB Created: 2021-10-10 23:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 555c7f27b8595fb96d391eb8045ec091 SHA-1: a032b84a4f93fc991fef3ea8b7e567cf29a21c9d SHA-256: 61eee187e099ad003e48a10b88a3ac300867bb8266e51feac203c05961ae00d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to various domains, including compromised WordPress uploads, suggests an attempt to obscure the final destination and evade detection, likely leading to a phishing page or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://blagoustroystvo24.ru/ckfinder/userfiles/files/semitubetavibekodos.pdf In PDF document text
    • http://noahmission.org/dataroom/file/vibegokiroxato.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/162ad92203e6f2573225660a29018ee1/65634068680.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/devotumepizofaposufije.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/91939800229.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/68651793475.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/jaderabo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161435ed59d844---fatamobafopimuwin.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/34598777312.pdfIn PDF document text
    • http://tzsunup.com/upload/xasexosul.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/26619147051.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a50fb10fa3e68b5e2633baabd634a2b6/jazuzebepuvuwatevon.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161506011ba299---gidurawibaw.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/xasenikexot.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/71583258882.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/5240282062.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/42133280070.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161327d9eca7ab---pexerejigugo.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/gibajiwusulubuwiv.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/90385466560.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/56236561967.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/35177737718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=house+for+sale+palatinePDF 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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 16064 bytes
SHA-256: 8d21f0ea0db44105e3b131737641dbf7b81d098a75ecd904aafbe54d76c5f124
font_01_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 10440 bytes
SHA-256: a76964bb414df76061c4f30a7f8188a94fa06c237c16b1a586bdbfe25f1d5313
font_02_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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