Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a68aac89d085836…

MALICIOUS

PDF

87.6 KB Created: 2021-09-01 20:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 312fa383e5fa64f8073a75e1634981ce SHA-1: 9caa0967b79842281970c95957e683ec6c9259f1 SHA-256: 7a68aac89d085836221b0a76340acdfc217d7ef86004d22b03e01682bf135cea
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'super-forms' plugin. The heuristic firings indicate this is a link farm designed to redirect users, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pistant.ru/uplcv?utm_term=anadiplosis+in+literature PDF link annotation
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/417d8a5aeed801ddca59b891af48f5e2/wuzurakazal.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/femanizilobidij.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7a3a7d7514511f1fb246c85eb85b841b/24632743490.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/63051298277.pdfIn PDF document text
    • http://emaaravm.net/upload/files/lotumexawelobuz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/bomofitiwabedoxut.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3e8c9e1cbe163c30f678aafb837c588a/gerozojuxu.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/4657425489.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/32652635157.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/movuxir.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/1ec6ce755e3e9c987157f0921b041c40/depenonudunevudokirovopiz.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612dc4797516d---gezuki.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6n0b1s8j1lt2mrtoe2jqk6f5kl/visutumorepeleruposuxipef.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/dejevajiw.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ec1iv1tdnld33grkhp8ha7i1u0/37390700677.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/bojowove.pdfIn PDF document text
    • https://euro-commerce.bg/files/volakesok.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b053bd4797b---fuvupimisejaf.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wibuxof.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/34771611943.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/72252011804.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/40229768221.pdfIn PDF document text
    • 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_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10464 bytes
SHA-256: dba2ce9f548d85321f576fba101b5bb8143e9836be5c3ded37c1e04b6aef0858
font_01_sfnt_off000104db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 20052 bytes
SHA-256: 02b6003c0cb1aa4bcd6b7401af3f64f225a0b25d513e95fe6d4a6d0bc81c6c59