Malicious PDF — malware analysis report

Static analysis result for SHA-256 f064aee516bb208b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-04 09:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27ea2f0f22ad15b5266846b003bce15a SHA-1: f6604b7cd263bae974fb58e272ea34491219d3a8 SHA-256: f064aee516bb208b4b8aed9123a44222afd072b0f20698666a14e807dc33126b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains a link farm pointing to multiple external URLs, many of which are hosted on compromised WordPress sites. These URLs are likely used to host further stages of the attack or to redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa615501f6---jarabozeninepin.pdf In PDF document text
    • https://fallsplat.se/file/7090746415.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/kilebezajorikirebopuk.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/61718985442.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/22039582696.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/42820906990.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b434f2c0a---54604972415.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/232333595.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0990b20c2---95200982321.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qfqoir8168gd806vujkdadd05j/kurun.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/alavoa96h5un5d3p8dbekaavb4/85924564997.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/65046867440.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/bogebalixikibarosiwuz.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/bujulegajisen.pdfIn PDF document text
    • http://crm333.com/documentos/file/3880562094.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161197c5f8a340---wopefafof.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf080709d---muzapewutokijixeg.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109032057068856.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/fozevanisi.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/alerlvncnpcndeb68thj9o1rlp/getud.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/f7b0931414f6a51df7550d02309218c0/89465290221.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2360600c5---60453755424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=five+senses+worksheet+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_off0000b60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 10608 bytes
SHA-256: 33e2365fc699774e737c69b4d7968454bf0f87923b0450317a8ea696e3daf375
font_02_sfnt_off0000e65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65A 14244 bytes
SHA-256: 3012b1de5dfaef3a4e12f83b3657dba7a66da291ec11ad56cd6103b745b5a8e7

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