Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a131e54bd1427c…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 14:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa9adf2be11610d20e21aa00136956f4 SHA-1: 638f3fa04bd1b56b9041779e113fbfbec134c1e0 SHA-256: e5a131e54bd1427c682fe2a9a98a9691d8fa2594a4ccf777e6481d3365454e4a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document functions as a link farm, likely to manipulate search engine results or redirect users to malicious content. The presence of embedded JavaScript suggests a more active malicious intent, potentially to exploit vulnerabilities or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kingsauto-bar.com/js/upload/files/527778834.pdf In PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/fafod.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/fuvuzogilolutelamaso.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/16515299460.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/58272117452.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/65044042776.pdfIn PDF document text
    • http://1careglobal.com/upload/files/likixaramefowijedabufu.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/65803329179.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210904072557.pdfIn PDF document text
    • http://snft.ro/media/file/56727135708.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/fixusegefuvikoxifeto.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/76658527193.pdfIn PDF document text
    • https://olterus.com/contents/files/wikorowubovaz.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/33591679201.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/bufusekovipetirug.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b68acf69a242b063de1d4163c3098d52/77547404106.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/65576039293.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/veboxepuzuwape.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/89502599093.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613604ec50b16---87379161328.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/novab.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b97746d14a---69908454495.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/19627088911.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/tazifutud.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130ec0070293---29268552997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+game+hacking+tools+no+rootPDF 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_off0000b26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 10892 bytes
SHA-256: 5b0ef7c96b271156a68214b93f4708e326a2b0892e080ca5b2eee0f254e01fc2
font_02_sfnt_off0000e355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE355 14820 bytes
SHA-256: 771652a7ff77f4bafc254066711bba7bb8bc21da22d75db5a16a214b9450477c