Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1aa08cd3f4f26f2…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 18:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 893284398f094d1e3275a9777bb43f69 SHA-1: c03fdd4b4a6046263a56bae23afe6a54ee7434ed SHA-256: c1aa08cd3f4f26f246e389706e72e47d79e10c023c76b1ce59775e001c84c463
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristics indicate it functions as a link farm, directing users to compromised WordPress sites and potentially other disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8f4aa4f77ffa6a25834d614ecaedba5a/tidalula.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129cf3adb0ce---16853802615.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/25902110744.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog//file/rorasu.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/valofojezozifule.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/78044544956.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/fe2edf39fddc112a8bcd44ef8208caed/25241477871.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/84e50f9600a1fe648a768973cccaf0a6/kaxutu.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/22760185232.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a151e321521---91001062103.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/77305227319.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707967f22c9---ziparerinitefisutetu.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/xifanusavos.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1a744e0073978299f64d91ef9b7c077a/305046183.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/dffb60e669bf009d6b10c3ffd34d6167/kejixotawuxubalerebigof.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16254200659725.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/zaxogafejunawofididutori.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/75177967544.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/58445126625.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/xisosapasikawuzegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=traffic+monitoring+system+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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 16684 bytes
SHA-256: 7090405b9866d30c8aaf82a98e815abe860ae0b0a6a4bfcc815a93269c99470b
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 10996 bytes
SHA-256: 11fad79c783e88623688781a57e15bb0364162f8a726d7f716ce999e11418628
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1