Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fdd220e7ab9ad6…

MALICIOUS

PDF

70.1 KB Created: 2021-09-16 11:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b56d0063b8471a86b0e63f993eede34 SHA-1: d48ba2b7d0aaea4d2a4bd2a43c68cb10e83fa267 SHA-256: 54fdd220e7ab9ad6d2cb6446fe1704604c2c2983cb3a2ba48b630054db971126
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135c0fdcf3eb---gozerikivuk.pdf In PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/25571253519.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7e8113f69f4205d42b36dfd80dfa4910/tonaxonekokifutazuko.pdfIn PDF document text
    • https://msiutilities.net/documents/sawotexotid.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/46544580832.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/faac55cebb3492226ca6aa9d6a3c9021/64964414539.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210905_452DCD1D459E51C6.pdfIn PDF document text
    • https://natanashoes.com/kingkong/userfiles/files/tuxig.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/54605071894.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/en635k263dtoo539jtsghhtq3s/23339154022.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/motavedajaviz.pdfIn PDF document text
    • http://innotack.com/userfiles/files/negivasatedijo.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/megemijawexanupoti.pdfIn PDF document text
    • http://canadianrockies.info/files/file/50867211272.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/pimurivebonomizeludibapa.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/pumezenozusoka.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161310308ccd89---bavuguzizodadu.pdfIn PDF document text
    • http://tabletopad.com/images/file/zuxuledetolemasaj.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/24828000750.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a20809daa9---libosujot.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8b5dc8b2d114e8119bcf6dc9ab82ed55/mupukimuluwadapozew.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff47d98eef---wupifarakepatefal.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/zanuridibam.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d969798e93ba520bee71ba8e0ad6a580/10785633826.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/sakisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=english+phrasal+verbs+in+use+pdf+advancedPDF 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_off0000b633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB633 14164 bytes
SHA-256: d153dcbbc9d16bfd1ef2e60ce4fbf321b8f58843fb914dd87644286fd1b90a9a
font_01_sfnt_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 10968 bytes
SHA-256: b9db8f5b2d7c9a7d627d2900525aead080237d46f5298caccf9f5eb8f4ec6462
font_02_sfnt_off0000f240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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