Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bb0d8dda8c13379…

MALICIOUS

PDF

73.2 KB Created: 2021-09-10 21:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b3f3738428cbc5bb8f8174f33ffe8d8 SHA-1: 46a0811e56044f7129f855024d4f1a0a7aaf19a8 SHA-256: 0bb0d8dda8c13379046790575955f2f8e759f29b2303bf5dc569faf85358122f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37885319320.pdf In PDF document text
    • https://ncvpte.in/userfiles/file/61454636273.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130006948643---fikirerisogodowovesifile.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f17c03015f---40683660901.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b82acadce---7190994604.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091021461832.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/birejukedotutizowufo.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/sipibitif.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/gowonuju.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/66521077328.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/vigesamoregirages.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/77891624172.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/fanenomujatim.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a667155---58762365192.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fabeab46fb---soxeravakozited.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9390f055e9422c0e66f09f57b27fbbcc/weborirugake.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/nowatiwo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161399c504cdec---35834935891.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/17780821458.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/powuruxabovo.pdfIn PDF document text
    • http://lamay.de/userfiles/file/porakiwofipazoref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=full+instagram+photo+viewerPDF 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_off0000b8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F1 17436 bytes
SHA-256: 3d8e05fbe239f1de801928a2a4e48023a4e7b15bebf0739b806198b0856bdc9d
font_02_sfnt_off0000fde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE5 10928 bytes
SHA-256: 380e0a0f2b7553c17506580e3e80791fe388f2e43698626894b183a4462282d5

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