Malicious PDF — malware analysis report

Static analysis result for SHA-256 37827a2aadd77cba…

MALICIOUS

PDF

81.3 KB Created: 2021-09-07 19:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd2dd49c3b1cde68b51ee02004b9c87f SHA-1: 735d70cd97af0ab9ab9b487780255cb480842e86 SHA-256: 37827a2aadd77cba44c8ee8626984fb2aa20ae4ddf263058e1ba407aece0797c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm used to distribute malware or phish users. The presence of these links suggests an attempt to lure victims to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083087a3186d---94954707419.pdf In PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/47739429189.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/16516446607.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/g4ps2m253rdcpf05c2p8fb38ba/36840903020.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e793b09a3---sakenaz.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/60444742011.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16123415d2d730---99561360702.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e965ef1f5---74726958394.pdfIn PDF document text
    • http://bxwlan.com/static/editor/ckeditor/ckfinder/upfile/files/43062483779.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/bujopubusojatemipovulizez.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/xupuvanipufukuvox.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/36354167551.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/88455041504.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/mopobobofinotuzigowadef.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/sugakunesip.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/70087953881.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/7n9ejsej8nlklm7l23skqqie4o/wowasusefurivosol.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/2496122193.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/rufamegidulabomevulonigeg.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/97471657697.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/11617462468.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tp-link+tl-wr841n+manualPDF 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_off0000cefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70C 21364 bytes
SHA-256: 5070529f408942d4f25cee11c6392b3ec1fbea7a0b1331d9c4a32f639798623f
font_02_sfnt_off00011e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3B 10608 bytes
SHA-256: 247cb123cb316122397aec345b3db6afa9383c736e41892cb5f6c5b2ab9310c7

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