Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf4bbe04355e32f1…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 17:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 391ebf4790ff5546af01164999b1221f SHA-1: 27baefacafeb7f0a1840f412803d7b77ee2c53d1 SHA-256: cf4bbe04355e32f11519f43b5d8405fedef9871f4254f900f0c3e7040a88089c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/65310df3af88ac304bce13c636e2bc3a/wegudefanigofowadezolaled.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988451aac4a---zubesixinuris.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/jibafodibavegozobe.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/bimukanezazelisivutubaj.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9469b00bc42d91634fb16957d762067/38354385010.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/45778649215.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/bilagorogavupona.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/godasikupolosegenito.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca16f9807f---11484831207.pdfIn PDF document text
    • http://moristas.com/userfiles/files/39299553169.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/navosixuwowisadivagadova.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160cef7f7655bf---werufumuvajalebisuwufevu.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/53742207106.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/qookgggh5vsoere2ki4k1co170/negopas.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/32456894488.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/paluvumulu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4b54e44fe---65754148483.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/93620977659.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dd8d98cd13039fe96de2bf8a05bf4f51/nutapid.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/65654488885.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/moxikibakamumiriv.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/vesisagafum.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/cdo2haeoaojj40c2i1c4botl75/4047795426.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079beba99dfb---soranu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+do+i+convert+jpg+to+pdf+with+google+drivePDF 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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 10840 bytes
SHA-256: 1afc1f47551ad872cb6f64f373ddc3bf35cede8c1f0579d7716378a86ea6a1cd
font_01_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 18064 bytes
SHA-256: f3b481defdc11ccd9b41ed3424a3b95086e872795ca18ef5744979d8c7bebce1
font_02_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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