Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f29e82f2b50f3f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 03:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 90709ca3870cad0c9f4c14f736260f44 SHA-1: 2b1bc596f77bb02cc322c12fcf9a7b3598173b36 SHA-256: a4f29e82f2b50f3f91434c0a13d2f5b40e31ea756c33af70d8932f6b84dba9d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, likely to redirect users to malicious sites. The embedded JavaScript and the nature of the URLs suggest an attempt to deliver a second-stage payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.look4job.gr/images/_user_na/file/29740673670.pdf In PDF document text
    • http://landpas.pl/upload/file/babizebinodirizepujipova.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/91367163399.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/4e4c83124a400667bba96321cf9f11e3/gisedofejosi.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/68899198172.pdfIn PDF document text
    • http://sciattella.net/images/file/39506366012.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/zokafi.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/62026666309.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af032b470c---2870387875.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/orafepixajedoz.pdfIn PDF document text
    • http://emannsltd.com/userfiles/53943726799.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/bufiwebufawutit.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/xeruweroreweziv.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/baxuwalabimeferuvuz.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/39729045471.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/86024893680.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/ludovepemu.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/bigekebuforasugoxaxes.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/gujufofi.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/mixalen.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/kajugipuguvonuxebisapewo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4a222b159bf93dff5ab74ddfc950f309/zeraguf.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/nejivopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=instagram+private+account+hackerPDF 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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 10984 bytes
SHA-256: 1f6de0754074e567d311bf0e019a6689a3117fb3fb3e5d28eaafe3d5aeb955f4
font_01_sfnt_off0000f1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CA 17444 bytes
SHA-256: e276bd3c74b7a5b6a240f67ac53939e0ad3ef6eb2ae848f5b91e5b403a53d90f
font_02_sfnt_off00011f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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