Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec93104d50672d64…

MALICIOUS

PDF

71.8 KB Created: 2021-09-03 23:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1e1d3a1dedc8a31f273c9e88de28cf64 SHA-1: 7d53cab8b586d153758fa6068971554353cf69ce SHA-256: ec93104d50672d64961b91c8f5d05933b4077f8d39ce26a1d448bed12a0df05f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inciboya.com/resimler/site/files/kikagorug.pdf In PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ded6f663f5---gedenuromanojo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/mqa2o78352t17r87adia34bqme/38097488652.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b516997dcf7---baxeretimune.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/e3cmsvfacnulst4beb2ga314lg/sakaxetejepijemifimub.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35c4e7b85d---ponawaxatolasexi.pdfIn PDF document text
    • https://media-get.com/userfiles/files/jejanupawebozawa.pdfIn PDF document text
    • http://araonline.hu/uploads/file/81122675701.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xulopazizijofidapawi.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/17910380984.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/56734882487.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/11325986614.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/lodirabe.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/resari.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d588c40fd0f8249955f6ca823d65fe49/96027512648.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a571677fd---68778992683.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/26419987233.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/18bc6db258d9cb4a164ae86782061bf5/medaxanepes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sentences+according+to+structure+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_off0000b5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CD 16708 bytes
SHA-256: 61cdbdc5a114c74e7832a97e086ab97bfe75dee5d29a00506c221ef52d401e82
font_01_sfnt_off0000e098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE098 10924 bytes
SHA-256: aee9ab19f1a421303a0084f0522c15f1c605a0674a31a906997737f503e26d8e
font_02_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1