Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc3a869bcd4ae9a5…

MALICIOUS

PDF

80.3 KB Created: 2021-06-26 23:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 035138e4e1509be5e58480cf00c4769e SHA-1: 587f850086dc6ccea9f4cb89649cb8c8c5391e2a SHA-256: dc3a869bcd4ae9a5daffe3446f0b4a7386aacb8afb914f1a8ff02e78ae2531ae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a099b4169---xaduwafi.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gakesizurula.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aba4e21cbb---dasuxawuvod.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ed4488178f1eda7062dc9bff5a9ca3b8/26779565104.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/fb5509b72ee4852bf5959cb5b31e4907/jetumosexekitoxolifobene.pdf
    • http://musikpark-live.de/userfiles/file/51132800730.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082a310d708b---kisagoke.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/galowulokaguluwij.pdf
    • http://cupta.org/userfiles/files/20210528163827.pdf
    • http://faw-asia.com/image/upload/files/dasupunogikujawanepona.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0e42cc87---63309166560.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/f275ad971cae95bc0703cbebefd68862/wurupatobunolajusobusow.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/26850483960.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd84c080b5---limirolewufolalibug.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb84aff1047---8933324520.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5b83f04a---59081866115.pdf
    • http://hrzservices.com/uploadfiles/file/xomopubetogepogedopemat.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607763d886b91---fowedobivanozabunogajowew.pdf
    • http://euro-ex.net/images/blog//file/koxezi.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lv6e82glmpaooa8chm4l5rl5r0/91971592020.pdf
    • http://zkojicin.cz/userfiles/file/duzip.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/avs86uj0bm56k81hha2dckka2a/25727710606.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tpmioicgbuap8uk8nqkgfc77k7/38959114358.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5310eb07---mopivizemiwogudemiduvuw.pdf
    • http://vizit-k.net/uploads/editor/files/dazawixoruxeliwi.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/m5n72qc8u5l01pb3s5nf1g7rp4/vidutorewavovad.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=of+mice+and+men+chapter+questions+and+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 16792 bytes
font_01_sfnt_off0000eb53.bin
b70c07c884f99d22ac5b84427d08357f7da86126b9508a4e84a7216ffb7c7111
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB53 11196 bytes
font_02_sfnt_off0001052a.bin
332ffe4c478bdbd77e572a653332b9222ed4c3f48c3aec8b369b3157e4340eac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052A 17088 bytes