Malicious PDF — malware analysis report

Static analysis result for SHA-256 861af40adeff5fc2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 22:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e32a4c5dd3b92c4d35a6fd9c1c906bfe SHA-1: 640f527da36d261d0d815a3f081f932804439deb SHA-256: 861af40adeff5fc2d0466a5cb02d31312d387cccd5a33501f818aafbb1e54a84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress uploads and disposable hosting, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/semibupakenirokabenowi.pdf In PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/rimabapo.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/wafodexukebaxori.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/lerukikor.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/dadikevojalalafugodimol.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/15601571230.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/42759742580.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/rubor.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/29319856584.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/b39mtt8jrje5lv0bv3v1qrlkqj/lakijedopofumepo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16138a57b7ecef---47110449505.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/86487270647.pdfIn PDF document text
    • http://intersonik.eu/upload/files/6969886013.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/48758975904.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/zerovejidoxibuk.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/11592601441.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/40171357722.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/45614693147.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/jozujuvisozutesuroworaj.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/80811039921.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/69356123396.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/56482098767.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/vixurepoz.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/23946305435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+sound+of+music+gomoviesPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed9091115c---bimijejobiki.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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 10648 bytes
SHA-256: ade0f48b57f460a47221fe07d300ab847a5765c3942a2e5f3d3aabaaf3bca2cd
font_01_sfnt_off0000ef8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8A 16868 bytes
SHA-256: a086656536a1ec396a0e42eb35ed0c0c8447497af0555c2858bbfc0c2b99702f
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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