Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5b8d3b559f1501…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 02:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da9f77ac9ea2cb57ae5405378aeccf53 SHA-1: 81f83c2c03c7e0dbe5b95bd02e326132dcead25e SHA-256: ad5b8d3b559f15016ec2ad9d6c83eff383244256baa3c2e73d925054a8fd63a0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to drive traffic to these sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=how+to+delete+event+from+calendar+in+android PDF link annotation
    • http://shiny-baby.com/fileimage/file/popikumamiduragoriradil.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/9499523537.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140a99d6e5d1---rovatozoda.pdfIn PDF document text
    • http://garderoba.sk/images/_file/10823073144.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/28606213600.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3b49c64e86130aa33c0be1ec5d194ef0/30416103832.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161310121e90f0---bofiwim.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/7fbbb14af338e80b1d9b69c7582a4320/kigopuninapebuf.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/46496700549.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210912202251.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140377f2abf8---japejawewizawim.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/wigidugorixikozumasaf.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4919c86e40b160612ad9b88769949239/motipidobamipew.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/vewafizigumadijisi.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/gozagozugexifoza.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/vinolu.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/junaditukinorolofifumuluz.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/40318145349.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16142a76241df7---23940947310.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/42477000036.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/kedofiz.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/noruxodokurufalewikujofis.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 10612 bytes
SHA-256: 1c6a76a154c405e9aa78cdb9e27110e468b4c074549a6d70564b4c1ddab69b63
font_02_sfnt_off000118be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BE 17924 bytes
SHA-256: 146f0b7357347c940c6616701d2dea66296db5096bcc96a7bbb0eeefb4dc5021

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