Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7aad26b5d128370…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 08:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6445605d7662ce5925010bd54fe4b782 SHA-1: 3a8965e7bf7fbf0fc5056ef15ce8997839d06af2 SHA-256: b7aad26b5d128370e8cf5c7b20da243f848d822b91c01e727ff53bf9fa7d8ad2
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 multiple domains, some of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://dokturmice.com/ckfinder/userfiles/files/88220515021.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613befbb33b28---mukanazafarebufune.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286c75e7d2---pasipepixokejowab.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/beburataw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161390ebec31b6---wafefebujunix.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/magizij.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/repigutufosuteforazur.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/bevojonagederomepalu.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/luwavafasojevovuzowov.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc762741e8---67886729511.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/rivalodexepolobewewepif.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/89269829586.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/36419764004.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f169cb1556dc56acfecb7ade09543aac/sonazajugumevaji.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/60733226029.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/55936414282.pdfIn PDF document text
    • https://triosms.com/userfiles/file/98216110670.pdfIn PDF document text
    • http://bdnchem.com/upload/files/legunowimexiludom.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/13615463600.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/88994919035.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/37328393977.pdfIn PDF document text
    • http://one9five.com/userfiles/files/8996941741.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f449fbdfb6---31440487870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=short+video+maker+app+for+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_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 17444 bytes
SHA-256: eaa6ad1698db36e18676b331e5ef632815f205c70e3eae0f0c54647e42fa4228
font_01_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 10780 bytes
SHA-256: 7d268defae8ac931ab16df509c91b3eecd5edc4e404dd9d20c4ef302b88a72fe
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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