Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d5c3784d1321de…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 05:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 429a9cf23cc5e24d3054e160d7d1c3e0 SHA-1: 0d085d80617de1d500ee54ecc915231bc6ba31ce SHA-256: d4d5c3784d1321de079957a6ac78049298fa0e8ba536eeb382ae33360e6c54a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/68f124ca8a5f083e5a11d63d8b211989/10735371306.pdf In PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/530f3128a4b053600c3c74093c4958df/xirulupusuduvom.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/mosuzi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/iq9h3q4dqbba3462jbllth6tg3/65666086883.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f2ad5b901---17612452494.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/42057844435.pdfIn PDF document text
    • https://dacola.com/upload/files/671464031.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/logajugudek.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/bawokagimidosuzod.pdfIn PDF document text
    • http://benrassam.com/uploads/files/66441759390.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfdaec2b6c---josasidonagilikufowex.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/85dd807ab0c7cb4c69dde72352f4abb6/57368996448.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/jotob.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/xusazexuvedo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e545b1318---jejavibuxiso.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/7909895104.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/86c7f3d48328e8d0e29213dfd1d1e007/jesolab.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/34a73ac7caa08329b03320a7d8c2ded1/5961932766.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/577860a1cb2e153ded01b34da32130bf/52360043748.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dccdc8a9---vanorogogepalunatuwipijun.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/niwazalixaxetitag.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/63222675954.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/5235820810.pdfIn PDF document text
    • http://toyotarentcar.net/FileData/ckfinder/files/20210710_3CA5914DB9F84FA0.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/798765748a7f99c742c676f7ec5cf4ee/koxezoru.pdfIn PDF document text
    • http://614move.com/clients/4890/File/51047434825.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f76b716ba---56930714597.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mitsubishi+asx+2016+manual+pdfPDF 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_off0000c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 11208 bytes
SHA-256: 54ec57f85d060651e3f1382dca12fa3a7d103b483d868b8f9f241697b91d6ac8
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 16728 bytes
SHA-256: 194b5f8b2ecbe7e1d295a7928e2b2858f2ce0d7f705e95f7528feea95abe13b5
font_02_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1