Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31f2b4380fc1425…

MALICIOUS

PDF

89.3 KB Created: 2021-08-17 01:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 58560a58906372299d7f925d0be61ddd SHA-1: 1d24b0bedb5c22e90718e7ad8187bcdceaf3f6f3 SHA-256: d31f2b4380fc1425f4457f1236f150a290742ed0bf1d2d7808e43adac0da504d
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, many of which host further PDF files. This structure is indicative of a phishing or malware distribution campaign, aiming to lure users to compromised or malicious sites. The ML classifier and ClamAV detection strongly support the malicious classification.

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 https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b40267d3c2c424088c3ec73eeff1932c/tobutalotipomiri.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610a10bad2478---75434742937.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/a1s2carjksa8t9lotil1pbr390/runopipode.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/timojobevigavebozopu.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/70097499045.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/3a757562f422515ace8130e3b1dffce2/1213685286.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7eb0d816f---nuluzewetod.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e04d8799b9c---42779002055.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/dokerijivo.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/24fca80110551d054fc701549259c5b3/25084107084.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/lovokupojabomugujojote.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/44820942575.pdfIn PDF document text
    • http://kme-kme.cz/files/file/54605797992.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/65fb209f277ed8f19ff120c2dec3117a/68261774499.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6e664bbbf769dbb4dafcf5fce81865b7/xumigifefetetisafukevi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/legeruneriniperav.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/cab13dd4bc55bf51617cca92d9d8e759/61893456438.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f966097cb---wakisanimudive.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/urh476nb458n2avvjsgs8evfjf/87275003916.pdfIn PDF document text
    • http://metall-press.ru/files/nonuxewok.pdfIn PDF document text
    • https://medtek.vn/storage/file/farizoxegir.pdfIn PDF document text
    • https://digireg.com/upload/lojewefesafunu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/89b4dddbeac9b8b13bdf380adad0e3a1/vobavek.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/kuhn7so52lfebl2ehun6ujd050/fefasilul.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/83413c47d42d0919ec062239cfd6ccb3/sobezizesiwidijeziwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=como+descargar+zootopia+pelicula+completa+en+espa%C3%B1olPDF 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_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 17960 bytes
SHA-256: 5c81a7008a75582f2895fb706165234ea7bd834412478a53f9f1f5b32aa10f8f
font_01_sfnt_off00012169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12169 11256 bytes
SHA-256: 9cafb5dbb086860b5ba0cecc6071b503be9c7e79ccd2f9aeb41071fb9d873f11
font_02_sfnt_off00013b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1