Malicious PDF — malware analysis report

Static analysis result for SHA-256 5677f556631a5a15…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 03:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34fe2951b4e067164b3e5e9a1cca6af8 SHA-1: 5c5c70c62834755a41608183e21725fde864ddbb SHA-256: 5677f556631a5a1517da84788f32b5ea8a5e8220369c5ed83c29539e0d35fba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, suggesting an attempt to lure users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=tartine+bread+pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a91c07d3afc19df6cfba69387483217a/sobopukupirabimup.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/15n7anqvh2uvmbaosgdug14iib/58401929468.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0jj7qncl21dh5kv4l5cleaq0gm/zumomorapefozusifu.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609455a1be61a---fipaz.pdf
    • http://drukarnia-warszawa.pl/pliki/file/72289855325.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/dc238691656e3002e9f0c2b34ef1f947/24704515331.pdf
    • http://novichiha.ru/pic/file/75072129666.pdf
    • http://cybernet.asia/UserFiles/File/nobuzug.pdf
    • http://verkaufs-akademie.com/userfiles/file/741406045.pdf
    • http://vnationwide.com/userfiles/files/sogerido.pdf
    • https://manorhair.com/uploads/files/202108171128108481.pdf
    • http://yugang360.com/upload_fck/file/2021-8-29/20210829115354590342.pdf
    • http://huile-de-nigelle.info/userfiles/file/sowixotusexisog.pdf
    • https://sport-jicin.cz/dokumenty/73285956907.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f97c098516---25353563970.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b663d6a3fc8---35400422528.pdf
    • http://levne-pohary.cz/UserFiles/File/bupafemitas.pdf
    • http://grupophi.es/uploads/files/20936064219.pdf
    • http://tourhong.com/FileData/ckfinder/files/20210805_81A4C2D754BB27DD.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160974eeae2a55---22646330321.pdf
    • https://lesfeesdelhetre.fr/upload/files/ginugopudige.pdf
    • https://ferdavagnar.is/images/fck/file/93811991575.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133e013369d9---bilukazunarolefatose.pdf
    • http://okfilm.kr/userData/board/file/46952971764.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93b04eb6d---furuwibaw.pdf
    • http://www.vljainandco.com/userfiles/files/xoroditabesiwevixawomire.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de27.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 16792 bytes
font_01_sfnt_off0000f639.bin
de6466c59d1d5c582c7d2ee2a7b818c2218a57743f563a18474f0a1a8acddd68
pdf-font-stream PDF embedded font (sfnt) at offset 0xF639 17180 bytes
font_02_sfnt_off000122e9.bin
9fbd6fbab177b2efe4a992c1f8215e6fd8ab0a35f04719fdc53c876ec66a9000
pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 10260 bytes