Malicious PDF — malware analysis report

Static analysis result for SHA-256 890d5d11fff81566…

MALICIOUS

PDF

81.2 KB Created: 2021-07-28 03:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c633a20cb0f4adac7c73dd7de90bf64e SHA-1: ebfee02b5e2fd9f46f5a61ded5a7a0588ca9596e SHA-256: 890d5d11fff8156623b8d28f1436163c96b043124fd35c5cf53f0938437830b9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3de84c72e---xeluvokosotuwalikin.pdf In PDF document text
    • http://uk-finansist.ru/userfiles/file/lulijakoloxivakan.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/gozapijaba.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874a8bf2eb6---tajagupofijabijodobu.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ade0d97ce---suxugitogeb.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/tijekure.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/r4qbrtqp2bm77mrk7dss803rl1/32520553208.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/kejebuwirij.pdfIn PDF document text
    • http://techbis.pl/files/file/98861823805.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/76241932043.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/14174739527.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ace9ccecef8---46194667683.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d4d75ac88e219122eca015e7e30d1b60/77949702098.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/sixovukove.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/0c78596af72a655e3855ef51cb59e603/derejofegobozasanoranoze.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/61034116448.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a8178bb3---92580423199.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/qu6anvd4o7ac6qf2iohvq792l0/33052604051.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/levakixuwenipox.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/tazegexog.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/562f0290cc0e8b6bbedbd9e046c768bb/35250084333.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/6450330452.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/mljiju9j452n2n3f2d36cr6sav/7695649289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=fundamentals+of+general+organic+and+biological+chemistry+%287th+edition+free+pdf%29PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 16604 bytes
SHA-256: 5e29e4f31c7e575a56a1ff3abfbba48c1bd35bb08619b94417e9467c8dc172bd
font_01_sfnt_off0001022b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022B 11604 bytes
SHA-256: 3cbf8bb1342887fffe1c7d4c91e84a1ee28333d5d8222f9e3f2b99aa745f56d2
font_02_sfnt_off00011d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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