Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda140b310309c55…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 16:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1c00202c01dcecee2ed7f0f9bac23ada SHA-1: 06df7d300760f4c1bbe3fe1fe3fa6353efc2db12 SHA-256: cda140b310309c557a8764cdfdb8c00357bd83e1b6bd4b6745b5875f4df0dca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://innotec-industrie.be/userfiles/file/69301737943.pdf In PDF document text
    • http://hiddenforrest.net/clients/76790/File/temonatisukavawixovom.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fowuvedefawanariwokufaw.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b78c46c3566---63284108344.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6f08bcfde2768608f2f1fe624e5dca27/93233146679.pdfIn PDF document text
    • http://hotechike.com/files/files/zujebixebojigeg.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/vodatorejezewebefowixum.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2ee13a72598d3dfa44e29fe05910518f/3980002928.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/191371ae74dd9ba7e4177f04a50d19dc/dijefudurozoto.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0ek9jp7eqc6q80l7qkdrhs0e1b/fumasofosufefef.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ba2cc6d13a0c959fb3e2b1342bf14c51/laserodarawifuw.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/44245680914.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/jukoboge.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e666c9b4ed4ce91d6d62977bccdd2101/13344695363.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/patopobidevi.pdfIn PDF document text
    • http://etnorom.hu/pictures/68757397361.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c538864ae2b---papipuzaz.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/pazesinewazojopo.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kilitox.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/24277808289.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/26754513998.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/52338190076.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c557863141b---83503416900.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/rqna3a9b0dbvr0te1omt0sp539/sukedoxugarefan.pdfIn PDF document text
    • http://gibisch.com/files/files/85155871967.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/fuwubib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gummas+are+characteristic+lesions+ofPDF 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_off0000c7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10740 bytes
SHA-256: a8505d29f78d478e38decfa3f647c8971b844e8fb55b5eb72dd584593085fb96
font_02_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 16040 bytes
SHA-256: 7281a89bfd86fb6dfd95ef7d071566cf79de5e795b817acec1035d62ce362707

Open this report in the interactive analyzer, or submit your own file for analysis.