Malicious PDF — malware analysis report

Static analysis result for SHA-256 43282378a3e09150…

MALICIOUS

PDF

91.6 KB Created: 2021-08-15 11:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 678fe84be08fd3a4eaf6bee4b92510f9 SHA-1: adf5800f76a43ba6b3e54646d05758131fc8f1ed SHA-256: 43282378a3e0915034300d853cad964516e7f45f8af085c2d6f33163e98a48e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to distribute links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/cecb93b599a6c98f5c428d1fba9f88fe/jimezofapilinew.pdf In PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/05b66bf16a29618abb72e6c8aefcb016/91272919960.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/43029850129.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072914a08ff2---xozomofexinemafamavebalod.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9483e6166---fasilukesurel.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/ziwopiworerupomafofes.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/22091384360d01de368ca4.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/joven.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9be751977---46868912032.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/tiwuxifedexubixir.pdfIn PDF document text
    • http://lagrupacio.cat/file/wetatakivopixalakogoso.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/87660431702.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/28588814574.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2d2ddd69f340a344f9a9b8608b035830/tazuviguwoda.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105230521255830.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610ac9117b8f7---82255197404.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/4d2e7130fb474a43bbed309d3ed4bad2/47661400978.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/donujoxopigeke.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41bf03da5b---47652264177.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f20c5cb8c0a14ab337d386bf9a952e0d/fajobizig.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/18616440561.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d21fea6d17dce9051fb04f37a4804fd2/sozeja.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/m8sur4bab7f902tk5cuma44fc7/wuxekafolozezaj.pdfIn PDF document text
    • https://highrise.pl/file/kuxofet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=%D0%BF%D0%BE%D0%B7%D0%B4%D1%80%D0%B0%D0%B2%D0%B8%D1%82%D1%8C+%D1%81+%D0%B4%D0%BD%D1%91%D0%BC+%D1%80%D0%BE%D0%B6%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F+%D0%BF%D0%BE+%D0%B2%D0%B0%D0%B9%D0%B1%D0%B5%D1%80%D1%83PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 22328 bytes
SHA-256: 69bdd526736f485996796e670a048ba642ef63fec37747180c329c27c6531f05
font_01_sfnt_off00011329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B40 11616 bytes
SHA-256: 0cb042b55d27c9e58c185d0f85898df8feceb57f80d89ad7c841b0dbbd00334b
font_03_sfnt_off00014642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14642 16252 bytes
SHA-256: 6d568972154aa9e6553788066da68fe6d5b0b58db67a92e881fdc4c3770f4e1b