Malicious PDF — malware analysis report

Static analysis result for SHA-256 592756440fb8bfe2…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 10:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 546bab7f5b042107eb8b2f179003a2f9 SHA-1: 3fcefd5bf84cda089163f37bba85d0d0980bca52 SHA-256: 592756440fb8bfe2cb698c3126e83dc7a167e6c0af57b43ab745ba31c39708a8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a lure for phishing or other malicious activities. The presence of numerous external URIs and links to compromised CMS upload storage suggests a tactic to distribute malicious content or redirect users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=come+comprimere+un+pdf+online PDF link annotation
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5b82e45b---10380399005.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db9375598---kebilixadulefiwosalud.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/wemimawugesomub.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/wusibiwufi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nexijegivogaxiraredaliv.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/96757a1e3c5eb1c7aa3401065dd3725a/83411410227.pdfIn PDF document text
    • http://teresachild.com/upload/files/45096909412.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4258087e---vujerimerogogojitanumejo.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/13237440817.pdfIn PDF document text
    • http://aimic.com/userfiles/file/79939641259.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/bopukasetadesinugukoruzon.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/87910256461.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121a6711f5d3---70851260093.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160975752dbd10---gezibisobozimunijowivibug.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f226d185ff---79337162627.pdfIn PDF document text
    • https://le27.fr/docs/file/puvititisovemawitozoxo.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/75984967105.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/24837795268.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/xaxonujaguzagufofijed.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c6c03ce57dc0642ca4f8a509af758db1/62865546159.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/derobimijiwugojo.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6776c98ce0---63059242647.pdfIn PDF document text
    • 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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 17752 bytes
SHA-256: 4ecf515975ca8c42cccc75d7558f2f0ce0e69d83408c5ef56c90be66cc214f23
font_01_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 10484 bytes
SHA-256: 877d180e10318abaf8b6a4d272304f96fa03d7478914121a938d7289505bf94a
font_02_sfnt_off00012503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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