Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a30dd456bfa0085…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 06:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f2751f30ffb2cfc8dd016bf7f467e38 SHA-1: efe7d5f9627192a60b3f5374fa532334d4f3c28b SHA-256: 6a30dd456bfa008542b8489786b9e54823ce02b1bba1305937dc5bb70ffe5e57
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://a1-automotivegroup.com/upload/files/22878889297.pdf In PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/26453566735.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/gopatanugisamob.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/timolesujosivofupavure.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/reropovagemimusu.pdfIn PDF document text
    • https://stvorki.ru/files/file/95075542577.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec1c3e132c---balup.pdfIn PDF document text
    • http://amandamaitland.com/images/file/dakegenirijinatesopofod.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/29f8f4eb5ee8fe6d80f900b8f98b1f7c/xexelavefisuniw.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae2461b41---totamewuluvabesi.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ad055a40---farasuwazonuramedoju.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/jtj8tjp4tujaq3vbh5edl38okq/10362640823.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-08/images/files/8476040779.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905230011.pdfIn PDF document text
    • http://talesma.com/E/file/13142797501.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/sokuvesuxafubazabilari.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/81415400970.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/48634499236.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f263a78ad8e546a021922f3ccda6c0aa/wozijera.pdfIn PDF document text
    • http://kme-kme.cz/files/file/zisuxa.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/88381516453.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa70e78d1---nolebomupivilijuxibupig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=principles+of+contract+law+pdfPDF 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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 17600 bytes
SHA-256: f803e23b1537b93bf7ff9a8f3432681daa2270d6b8da7ad6abef1b8afa10c343
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 10700 bytes
SHA-256: 005dc3c6ec42748b5bba3f84add139dd43e06b60bac48ba40d92aa3e661bad86

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