Malicious PDF — malware analysis report

Static analysis result for SHA-256 2443ea44a41f6fee…

MALICIOUS

PDF

91.3 KB Created: 2021-07-05 08:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: f5c91eb805dd79624da44e03d63fd9e7 SHA-1: 14ced715ff860971030680bcdae9cd4b7e813cd6 SHA-256: 2443ea44a41f6fee353b116f8d66dd94fa669c40d980ff8cd9442f9e411deb08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, constituting a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://smidgel.ru/uplcv?utm_term=dating+in+the+kitchen+drakorindo PDF link annotation
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091da756d70f---fabes.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202107/file/1625384827.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0def6917d20679432fd6cc1c7ada1468/likemujavazujuw.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/17817142241.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a83dbe9a5---20018964326.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd711c4f13---84430611511.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/39361436894.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xijugaw.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/fumugefibuzajaduzimuk.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bdba9908026a057a19aeac7378498396/14562975339.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/23527495342.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/kupuji.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f07f69a2f2adbbb63497d68d10589b0c/52639369275.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/34272421898.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/wogesuv.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sitivuzawimiz.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b594d494d3b---pakapozegulipig.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/aqqalv180koaccrs6r42e13tgg/zifelarogo.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/5c72431ff658d25ed41836119e663502/11448129247.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/69931606041.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086003e27f3f---17734288595.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/9783594769.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16916 bytes
SHA-256: 2b9e2eff6e4367808daf672da2c83565150f7bfca4ee885006f1ebd7f5344f99
font_01_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 16392 bytes
SHA-256: 439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d
font_03_sfnt_off00013a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A67 10528 bytes
SHA-256: bcfcbf54c397c43b65ceced4e3d25174cccf0ad8d10f8fb61adf15e633443ee6
font_04_sfnt_off00015218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15218 3176 bytes
SHA-256: b4964545a6aeac786ff6c750c5b2a3386d81e0c57d628af8f889365cb9b0f9cb

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