Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f773f7fae7d80c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 12:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e9dd9b7c4213d9d7d13ab06e06dcedfb SHA-1: c8e82f6e069f352c4d3d8ccdb870ad6cb8639386 SHA-256: 20f773f7fae7d80c3bc925b4657d0e8a784cca714841b5ff8300a9ce59b2578c
172 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. Heuristics indicate a link farm designed to redirect users, and ML classifiers and ClamAV strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common component in such attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4p3ae7ip2m3ac8tpa5a5h3kpq5/kofaduvuvetir.pdf In PDF document text
    • http://msslink.ru/userfiles/files/datutogomedaruzo.pdfIn PDF document text
    • http://www.centralperdana.com/file/30859818237.pdfIn PDF document text
    • https://norservis.cz/files/files/sekitu.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/buvutanurogitogedi.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/zasew.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/50908885122.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/mubexawiwolagukogebev.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/80c553d77512c52835d3243626e5ee28/giwulijaz.pdfIn PDF document text
    • http://taxfreepoint.com/file/fumarakabej.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/giwixexile.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/89302899377.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/69941804338.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/selokopugopotujipofu.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/nawopevajonowe.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fd67ec7c4698c0ed7fbf8de0e960e032/woxasunovapexow.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/jetufajiwitikigix.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/nuribewofejir.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/romafilolomonuko.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613025185b3b5---radozigopiravi.pdfIn PDF document text
    • http://heart-calligraphy.com/uploads/files/202109071559346244.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/bebonudumixew.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2d197d89---62817041045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=filmywap+2019+bollywood+movies+downloadPDF 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_off0000e227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE227 17888 bytes
SHA-256: d9cb85863a3013675d2df20226ba83c81a672e12af0a733e7ca9db726e528dd5
font_01_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001288b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288B 11200 bytes
SHA-256: 0c10bf51472c280db86d07ad99020af995c2e51153afffaa5933907632085c13

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