Malicious PDF — malware analysis report

Static analysis result for SHA-256 3190a46cf77c34bb…

MALICIOUS

PDF

90.8 KB Created: 2021-08-19 17:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c5a4f3b1acae8030867fa16c0baca6b SHA-1: 448b92519c45ef0407cdd9f8577a4453852426dd SHA-256: 3190a46cf77c34bb94472384d8d606fb9c5e43d9f48a1cb8e31943f6780820ed
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading a password-protected archive. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for delivering a second-stage payload. The embedded JavaScript is likely responsible for initiating the download or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://medvor.ru/uplcv?utm_term=videos+de+como+descargar+internet+download+manager+por+mega PDF link annotation
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/sngfhhbqlc2fstpoh4vp9f4vs6/dalujirugewadopelaxinab.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/dbbdb4596d3496ee1bf24879d15661f0/vezajifuwefixepewaronagu.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/78323847852.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/85036809041.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/wipatumokolezefoduxemasa.pdfIn PDF document text
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/49713027438.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/60698821034.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/74039628484.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/nemib.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/6428652819.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/29f6a67ff9bfa61a2250078bbae0e1d9/51503821608.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9fb54240f889dee8fac10f38d746348c/23043654839.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e259d0f1b1---niruvebixabig.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/80173694075.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d793ae0cebf62b79a81d0ece67b945ec/59599173698.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e4b3202fe---64511753546.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2b6cfa5c9e3f1a4d3a84edd6f66f47d9/84487471878.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1611db6e699f27---57964238691.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607372092641e---pidezodi.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/bolujizobaxudikajol.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/c8e82b252070ae7d3833ad1d3dd44a4e/potaxoge.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/3885c8fa1dc80cef29435529e084c937/85255854794.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/vuloduwodofi.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/vesadopasuzewadufap.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_off0000dba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA4 17992 bytes
SHA-256: a6270d21c4544ba3728b018c899d1ae088b5d332a902b5cb16d093207740876d
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 10912 bytes
SHA-256: a64f854e81c7ae681f90fe3c7dd902f67875888f25169981ff0fa2c431758b9e
font_02_sfnt_off000122a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A4 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_03_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 16452 bytes
SHA-256: 1d2a7288502db1f79048ea121eef1b14c6efbb38c5b54d2540a3873fe7a186f7
font_04_sfnt_off00014192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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