Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d78afe9537a5ae2…

MALICIOUS

PDF

133.8 KB Created: 2021-07-06 18:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3116031b03698451b2a5610f87342746 SHA-1: 382f64b718e8a233b6ab8c069c631811b7111d43 SHA-256: 7d78afe9537a5ae26103f374e4e2e94d58daa29a470d4318c1ee4a33a4a8f54d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/54a505d47012b96f23eccbf5f9be2e24/99010929559.pdf In PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab763bc322dcf3415e3dacfd0b00ebea/7495696039.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49fbe65ca---18295877831.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160cff41f704ae---sorifufiremefa.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/75978479430.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/9l43r9ocho7nfik1fk7qak4471/jewixawenif.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077dddc313c9---60499903388.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8t8g8u73an76k99paa18bq62ge/42460866417.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/jexexupavajenatiril.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829a1e9abd2---dagonatib.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/loweparorudugirekijere.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609496b1b1481---wajavutaroli.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b850bb2c0197b24a48ef226401fcfc74/8109353922.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/6b3e5eb7199614a6cc4e944a19a96582/28033046960.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c655f42877e9197cae97871f86f8e28/rudamutokizabag.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621005211.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/39705110171.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/giserapunudem.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c8232a6242d3b789a37a1cb5a7c964f4/80441456174.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/49ae2673bceb56f46c03b2aa0d4b797d/xazuvozukubo.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/0h4s963fl5jdu6gdu9brskbkqe/kaxirotexuxoginuzo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/labapunisafizapa.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/85342553416.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09f3e898d---2690100003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=conscripted+into+the+armyPDF 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_off0001ac79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC79 17124 bytes
SHA-256: 5ab1c9a18015ded6c160e5ea6f58a9e7490020029fb442f5bf7ec2446ca8cc1f
font_01_sfnt_off0001d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0B6 10876 bytes
SHA-256: 5eb29b59f92304ce5819b3229357a415a36c3a6e85ff9491f99afd048a530901