Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea877085466aa45…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 00:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3e00dba9cc04b0296f98167bfc60fa73 SHA-1: 329f2ae74bef362eeb807b965e9d26f8db68b044 SHA-256: 4ea877085466aa455237efe8eeadf07d7a4f1b2d32164000a50fb5c27b931f39
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5305

Heuristics 5

  • 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
  • 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://coretry.ru/uplcv?utm_term=retrieving+deleted+texts+android PDF link annotation
    • http://nelly-design.ru/upload/files/57685525714.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109190311502461.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/q18ej77cir2l01eakgqci0pi64/jugazozi.pdfIn PDF document text
    • https://alev.az/userfiles/file/24662830022.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/17673878438.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/gupukulilojazazuj.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/lezuxujagofaranadatodi.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa5fe4b35---megope.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/wukurajos.pdfIn PDF document text
    • http://soles2walk.com/data/file/lofurikekefetikujekexupak.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dacc7f4c6---66111180598.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/juxapomifuvudu.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/rekag.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/48360317753.pdfIn PDF document text
    • https://stotex.rs/files/fotalipudirefimo.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/worafemikukagejafat.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/63501831368.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/jasebejopelap.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/vedanujosizasixapetotav.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/94689803981.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/sujawesosuna.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/lebosanog.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109181527072813.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/39614740239.pdfIn 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_off0000da07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA07 18792 bytes
SHA-256: 5dbaa89ea9b08071aae394dacce14827d9d57c2e8581a7c36c21ce019d67d413
font_01_sfnt_off00010a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 10636 bytes
SHA-256: 1bece733816d587abb6fd8cc236cdffcdb065a29832521c314eed87d95f2b7ae

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