Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a45b46f0d202231…

MALICIOUS

PDF

126.2 KB Created: 2021-07-27 00:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d0bdeb933f4db53e3c4a7a9b61b1975 SHA-1: e74269404804a47909b77a3de7da451aa6ab4325 SHA-256: 1a45b46f0d202231ff5a71c70501b5067c5685bd943330bf517f718f20da5215
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also hosts numerous external links pointing to compromised WordPress upload directories, suggesting it is part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • 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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf79af002e---rinawilefibigedudi.pdf In PDF document text
    • http://alliance-vietnam.com/upload/files/woxebore.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/lalituwizirixedajidiz.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c3fb7e4a166c0ff0710954d3e257509c/suwolixofifazo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6f7a9026658190498b86d9bf39192485/tudiduso.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5b848fa745fab0dd01038b428a858db3/46884360217.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/cebf7dc2dbabdb7ed3e1107f8ff9d831/ratifovegefew.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7d1a44739c1b4b50b013d539ed471d29/53883581017.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835e27b5f0a---71814856567.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/siimf9l47hlcql1i0uf2lh8l3h/85465577202.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/190c5de5b2a2cc17237220529bff8a53/bugekanidobudurotu.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16095d41675950---gugas.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/bq6llbgvgd55gfh66ls5162ga7/lebuz.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/25194169136.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/99678965348.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3d0383456---xenarofenekeserepur.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b459db072a9---pujiwa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1b76b29c---70539866739.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/doruzarubolozu.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/nekinaturabuxegisos.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/60561536950.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607515ae4b624---xarepajuvaganomixire.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/42481886034.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec42ba2e245---88310513293.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/75028367945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=marvel+super+heroes+vs+street+fighter+arcade+spotPDF 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_off000189f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F2 10952 bytes
SHA-256: bc5d94b5e98fad17a29b654d7c90bb712bba5f132a77c3ec47cde95564e4ce3d
font_01_sfnt_off0001a354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB66 18112 bytes
SHA-256: 12c6ec3bee3a3ab41bb3cac44b95698edde4079336c20e8bb0459ee515826ec0

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