Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ef84bf12043899…

MALICIOUS

PDF

87.5 KB Created: 2021-09-22 15:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 41f5f529b09dee7bf177bab02f97231e SHA-1: c4d8f1f3688aa92908723400e65b45984586c733 SHA-256: e1ef84bf12043899c17ccb823bc2712ba526868d05be9b59fa9d0e149a2d8002
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://medvor.ru/uplcv?utm_term=cut+the+rope+time+travel+apk PDF link annotation
    • https://narellesastro.com/userfiles/files/2146318671.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/gutusakolup.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/puvuwuxepolesegujigiwijoj.pdfIn PDF document text
    • https://phr4u.com/files/38079782433.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/xotugiro.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/41800602770.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kabig.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/87044041462.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/46476361220.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/gujesufinajogovuwo.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/42178038374.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/29201818405.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/boxufutumesosaji.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/dedisetodir.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lhs4li6phcf56lk8hff7rvft80/3663675890.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/85384682912.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021092115555411451.pdfIn PDF document text
    • http://recviem.ru/img/upload/25646418696.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/xusoregapopuvose.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/99612205929.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf551ddba---78672941644.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/vinitunetufilibekogava.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/56381614856.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/a43c90rtuqhf0o8lj1159tu161/selidozifijirekevoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 19800 bytes
SHA-256: 230a55332482eaf68057cee36178ce1547d4cc9e05694c9e8b6eb48f1234799f
font_01_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13821 10536 bytes
SHA-256: 37888b8b802079d55367bad14603f346a5e226a0678d70ba14aa20d3232ff059