Malicious PDF — malware analysis report

Static analysis result for SHA-256 087ad3a81b1c120b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-17 23:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 25cb948eb9e99ef6fd79e08df168de8a SHA-1: 0f5e88696ac378f962463960240f07c26b7dd579 SHA-256: 087ad3a81b1c120b9f210cab81e1bef5ff2f331c7b8e815613cd2892a2e36a19
196 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. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into updating payment information, a common tactic in business email compromise attacks. While no scripts were directly extracted, the PDF structure and embedded links suggest it may exploit vulnerabilities or redirect users to malicious sites to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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 http://a-b-i-s.net/layout/bilder/file/94435220789.pdf In PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/10413812201.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9e7a00f4---96995490161.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363dc44864e---girubigosupobenegoxitesu.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210902002820.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/29288388448.pdfIn PDF document text
    • http://hanleyresources.com/images/62083258584.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/17ac1febf5d7455a36289647a946109b/17689610260.pdfIn PDF document text
    • http://ahnil.com/userData/board/file/ranad.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135afa531c51---71032338120.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/67996412124.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/53387899316.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/xuzupoda.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bad2a6a32b---94001406469.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/96584636117.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/tupimilizinidumupeze.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/79860672202.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/71938031660.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/xudokojinilimuwer.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/tarezevawizajenipuparejir.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/90270845330.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/bizoxitex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+transfer+to+new+phone+androidPDF 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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 10628 bytes
SHA-256: 96e842cd11628ebbf10df1ccf113261aa91ce65b93a1976912e1142b183a3907
font_02_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 17832 bytes
SHA-256: 166bcbd504feb3dd823b648d81c4814ad34e84a4d4fbc5fcc776c79dc8106f13

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