Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44cfb3be95af93a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 12:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6bcfc85c851cf0795068d5ee97c566f4 SHA-1: e6630feb47b897bca29d6e46de2b68a563d2f644 SHA-256: e44cfb3be95af93a303232c193452e71877afbc345e3016a839627a3023a7561
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, so the primary attack vector appears to be the malicious redirection via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=instagram+mod+iphone+apk PDF link annotation
    • http://textingrights.com/userfiles/files/36293717442.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/riliximaburisukalefere.pdfIn PDF document text
    • https://kawanmto.info/contents/files/renumoxu.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/89918657984.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/nawosinazolejujejap.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/23917399171.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/pokosodiratewa.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/67474713598.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210910_70E6F7664AAC2E2D.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/75308573127.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/nolitamujukofunuwowu.pdfIn PDF document text
    • https://afma.pt/site/upload/file/8580927202.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630831772_1.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab9694cf6---mawugazororuwi.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/rixaxa.pdfIn PDF document text
    • https://bloomeng.com/uploads/pivipokubarowu.pdfIn PDF document text
    • http://scsytech.com/upload/files/67084486029.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4eb83825078ea5faf1fa416d4d4b00e7/lutudozirapaw.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/72109639218.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/16f8b029ef80c8f2e4af38f4961db69f/34343674054.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/maxona.pdfIn PDF document text
    • https://n-tlg.com/files/file/borak.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/kotod.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/vufusedejef.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/97533445809.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/56129865163.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6cfdc33b2---semulesizipukatupetus.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_off0000e920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 10836 bytes
SHA-256: 39a43a64110925de68203b2940f625a9b947e88e671b8a7271fb036e767ee80e
font_01_sfnt_off000101b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 18852 bytes
SHA-256: 1d99a2cd43278d881317a00f2fdaccfaeb79cf6cd6da61ef54cdcaa0f23858a8
font_02_sfnt_off00013210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13210 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1