Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebbaa3835fd0bc9…

MALICIOUS

PDF

88.7 KB Created: 2021-08-13 10:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f3c28276c9b1c255326557413e6d5d5 SHA-1: 23470e6a742587a5aee0152acfab1eae8faf3b5f SHA-256: 3ebbaa3835fd0bc9d0f87d3228f2ff2c3cb7d073a682e9f5ff1437a29cfbca99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/a28brnbddud6nnu7kt0sc459d5/sabiwiwofudoni.pdf
    • http://isleford.com/filespath/files/20210812160914.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/d23817b919dec10a8fe6ff793975ca69/56725082620.pdf
    • https://godahoian.com/app/webroot/upload/files/bawiwuxupekuniwodunuvulok.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/752ec575bd52e97620cb7e4b201507f2/fusijifafulepinu.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7de0f9504a---muguteto.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/i6oqqoelrhi0592hfm5hjtkngf/77336151398.pdf
    • https://damiel.eu/userfiles/file/zodakopukekaridaxigam.pdf
    • https://serwisnawigacji.pl/userfiles/file/85522952959.pdf
    • https://asiarsolutions.com/userfiles/file/lobimuro.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/zusadiwujo.pdf
    • http://au-coeur-du-temps.com/userfiles/file/dulixodasibol.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/du53jaqb7l1fno8maabj8n0pd1/84237624638.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d494579d---ramopiga.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/jekebiwovom.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b717115095939881a6c672f843fd119d/vatekukukadarezeditosa.pdf
    • http://guowangcable.com/d/files/ropaxereponoxedelisimezi.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eef529376---nuzukujumuxexozujoxolodis.pdf
    • http://timnhanhonline.vn/upload/files/92804582413.pdf
    • http://dsacare.com/admin/uploads/file/29408820251.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d89579f3836ccebb0699a1376ddd5e16/80216398048.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d493fc9547---kaxaveboziweruwol.pdf
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/denepineteditu.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/62951838142.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gta+san+andreas+pc+game+2020+download
    • 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_off0000f5f5.bin
46df597280de31dec5db0bbe3c6c102b40ba84fa0042d0be15c29e91f1561b2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F5 17204 bytes
font_01_sfnt_off000122ed.bin
34b883c3dee9084b1f1e4191ef02cbc8d3a6e4196ad9abd04188525108b49ffb
pdf-font-stream PDF embedded font (sfnt) at offset 0x122ED 11132 bytes
font_02_sfnt_off00013cd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD5 16792 bytes