Malicious PDF — malware analysis report

Static analysis result for SHA-256 f994fe1a5aac0bcf…

MALICIOUS

PDF

94.1 KB Created: 2021-08-08 10:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 14f92ca4d30bc873650a904687661164 SHA-1: 510ce5953ca81d0e715082f893498db1d2e9c59c SHA-256: f994fe1a5aac0bcf81c03bc45aa7a12c5c9e40916467a57d5bea8da6f4892ff4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • 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.
  • 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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/lebov4v18qn4t1iuqdccvd38tr/lutosegibub.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608d57a52d5d8---85420885672.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa019f32df---sujigumawab.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/och41m3qvgsbuik9ifpmfrrhj4/bobubatenumefaj.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b40b9658d2365511fcec30eb597dfb85/lunaxegozuwowawitigerelov.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kurapu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4d3c4be2---16550298373.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/xoluvosavaxerikosawosufut.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d5d117cd9fa017dd5ed7af3414bbc4fe/73845154666.pdfIn PDF document text
    • http://51www.org/uploadfile/file/3f5346a098af072905031ff07223c641.pdfIn PDF document text
    • https://akemi.ro/hirek/file/monogote.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160708625a7f66---mavijodafal.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/pekojizezez.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb27a9874---kiburedojanufugofigukot.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0cd4a9adc---27913857813.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/joxegozebafofeneruwujopif.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/dagalefixesugelup.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/45594623103.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/sakabibajedivofenekiw.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607934073a54d---64493091428.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/12351908453.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff6adbaca---44315851150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=livre+physique+chimie+terminale+s+hachette+educationPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/951b24a2499af27ab33e6f43bc4cb2ed/37074219711.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAB 17932 bytes
SHA-256: f87adc6cfec5418a6662ed0b82ceeeecaa31e29c68d07a51821cc6b27a6d597e
font_02_sfnt_off00013ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC1 11160 bytes
SHA-256: 1644d7d393000dec65a12fbaa95fa0c02d78b429b230415f5a65095522f15a2f
font_03_sfnt_off00015478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15478 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

Open this report in the interactive analyzer, or submit your own file for analysis.