Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2412757b97f3773…

MALICIOUS

PDF

102.4 KB Created: 2021-07-07 17:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a25471574aaff6333905d1cc3ffc9d57 SHA-1: 1f11cac8d7b5835ce609c7da349318a92a2d446a SHA-256: c2412757b97f37732b6ae490c42743c069fc8e35fd0ed2a4345c9c486f8846c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The 'wkhtmltopdf' authoring application suggests it was generated programmatically, consistent with automated phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://krisoc.ru/uplcv?utm_term=hid+compliant+game+controller+driver PDF link annotation
    • http://emailreceptionist.net/userfiles/file/58232944273.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/18231506694.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/74995153670.pdfIn PDF document text
    • http://chongros.com/userData/board/file/76574801100.pdfIn PDF document text
    • http://texmet.pl/userimages/file/63105067141.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/vasapuvamumadu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b80b1193---jeletosisoxe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/89ff24777a3d06e3256567fddc9415d7/88988369480.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f1d48d5b5---17231002214.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/4ecpksn7kcbtdjl4d3b1vkql2n/33118623219.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8514472c---45934086725.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/8as8do697r92u1rsraru93h196/35728292334.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/xelolilepetobupizan.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83719237b3---39481088908.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/moten.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2697bca1c4---vibakuzewodutikojokol.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/kanisonaravovoder.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210607031403_v4jvvh.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210611_D4B05E0F1892AEB5.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1b1f2d25---xevidajexexarobod.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/06c71f2a6520bf00f3326116dd022d9f/4616485656.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5020062a1f---68100265428.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/foxinilova.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/0a76661d1b0030284c60bed4942855cb/67670053813.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa4d4d8a3f---gelawonised.pdfIn PDF document text
    • https://synersys.fr/contenu/file/kedukikatijukaba.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00010db7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DB7 18244 bytes
SHA-256: 422921b84a125e76fb5add3492afc702899ddb7ec8738381d452e4f3d40438cb
font_00_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10744 bytes
SHA-256: 16954205d728b432e330c820310a4cf86e04cd2538d70045475a53815e59303b
font_02_sfnt_off00012a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000142aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AA 24620 bytes
SHA-256: 93a431863c5a8f39dcbd169921db96f658144ae893d63b46c1731546d8bb3ee7
font_04_sfnt_off00017fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FC8 2572 bytes
SHA-256: c954451974072cb51c1c5cbe6ec53d930c6236633e0ca4253e84225d4f354734

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