Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ee838e3022eb89…

MALICIOUS

PDF

85.4 KB Created: 2021-08-19 19:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e116a1878c7cea38a35d68696dcfdf5 SHA-1: a546da578e94ea04343df1c3027faf6b21004f22 SHA-256: 83ee838e3022eb89218a91aa0fbbae43e742a288dc2f2ca1c20ba19e26662545
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16085c6e004ebf---25590500509.pdf In PDF document text
    • http://appletechsolutions.com/userfiles/file/jixowawovuwitet.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078530276fcb---lakoxafegobafoli.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/79784340789.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48a7a2073b---sezugil.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/g945n73hkaq24qf6kpc81c0434/84879795221.pdfIn PDF document text
    • http://crabber81reunion.com/clients/b/b6/b60cf3d631ff247311937b5f15bedc89/File/nusowagixedifotewamis.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/pokuwogatabebaduzesup.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/784i21jh0fq52f8sdop5tpcth4/zazudijaresusaxexevobolof.pdfIn PDF document text
    • https://oumkua.com/userfiles/file/zudutopa.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/30910530887.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/56175722964.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-8/20210508055110622342.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/29667384534.pdfIn PDF document text
    • http://davcpundri.com/css/file/26454020163.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077785739a06---somazulibizimen.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/05b169bebcfd53c5961adaee63b600c8/54222346603.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/4509884829.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84437e133---rusotunipurulivipixamim.pdfIn PDF document text
    • http://rurisnet.org/images/file/foxurexid.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/degezamojogafet.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6517324e49---rukixo.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/88415299839.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/lavimufuweboduwij.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/50138186081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+cook+a+fully+cooked+smithfield+hamPDF 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_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 10920 bytes
SHA-256: c88fbf6f6fb3e9a51ba684d1399dec393a8a1661429178a9a58a235f0abc883b
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11747 17292 bytes
SHA-256: b73ddc05607f947827d84974f4b74610edf7f7caf648d55c0ea00e16385cc6e1