Malicious PDF — malware analysis report

Static analysis result for SHA-256 a41fb48a259f534f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-14 01:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1fe477c63278e9686e9fa68860c4ce5 SHA-1: f146a1db7adaff0243d61a402b2de678a69d854f SHA-256: a41fb48a259f534f188dcb44b8efc685161837861b3614657a382e558e6ab415
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure malicious intent. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sportsclinicwest.ie/media/contents/file/43818100130.pdf In PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/tasekaxawegofotekevuli.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/53068163492.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdaa4e94d---nalobovaxakup.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/sulabavivazivepixotiluke.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/tejedovijonibikizevakivuf.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210903_A8DE5AD0F1F7E3F0.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/zelajetajexojad.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/faxinat.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/58121713946.pdfIn PDF document text
    • http://kammed.com/userfiles/file/46266981455.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/mamavepa.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/49833121777.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/peluxewoko.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/daveki.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161323ef88d587---xawetoxevomomu.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/jutux.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/65833784488.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/sebapa.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/97169867546.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/50605805483.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/384aa9102789c989a2851b21dbd2e595/terijekuwegaxutaxaten.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/pifezojefa.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/10027424564.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/lubadasiledikapum.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/zapas.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/jekodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hangover+tamil+dubbed+movie+onlinePDF 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_off0000c592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC592 10720 bytes
SHA-256: d39d77ff6a1b6b24f1f23bd56249900cba7e0b3cce6492447526f1f1ab505cdd
font_01_sfnt_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 17076 bytes
SHA-256: 41f2351d3b9565698562f5d18ea1a7297716a3847f0302fb46024b4e4224010a
font_02_sfnt_off00010a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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