Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8f7e92d46f25c3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 11:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1b71290650d2c99d9e811cbf1ed87f3 SHA-1: 95fb2335e467719fa855353405f12259daf98005 SHA-256: bf8f7e92d46f25c39d93f10350a4b87ce47c9398f52be4c27d43357769fe705a
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 executing malicious code. It also features a link farm pointing to numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://chennothinterios.com/uploads/file/sijavujeje.pdf In PDF document text
    • http://www.findvoters.com/userfiles/file/mefibexitupatolo.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/13379908029.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/37421197879.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/jelupinezuzulinoti.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/50357358237.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/jugubodilavolojutejoda.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/66958408177.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/34469525746.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f406b4f40545277b7a7c7df603822ab/jepipitogogafigo.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/bosekogelikavukef.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/9653141424.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/30347483510.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bejupawupimugekile.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/94823005030.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140d53fd7e89---6758462875.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/bolebin.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348048da5e4---74045325360.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/puwuxokenebapej.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/jirepijaveliwegagul.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/24170913356.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/pemuvakejomirobegu.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/19/toxuzagezopa.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/88827281383.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=banjo+and+kazooie+romPDF 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_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 18872 bytes
SHA-256: 435a5fac64679506d3840eb755eeea5e7e6a0a09a617422026ff869424bab344
font_01_sfnt_off0001119a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119A 10432 bytes
SHA-256: 84112ceb2382ae2fcd716b19b48ff6cbf9f62c7578ab67000ff92a8c40057515
font_02_sfnt_off00012937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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