Malicious PDF — malware analysis report

Static analysis result for SHA-256 40b047d1e15b5582…

MALICIOUS

PDF

78.0 KB Created: 2021-08-28 02:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6540c0d667d5196b0de9838b8304fb7c SHA-1: 3f880eb65bc4e630c34f4ca08344bd270e3d87d8 SHA-256: 40b047d1e15b55825a6b233671573399e3b921b684822baacbe15c965f1764f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ntq00vrl9e6abv7ehdetbqqiag/16025580084.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/54iacqapcf9t90luf0jopgmo4p/wiwita.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/054b7c553ced67d92e82840ffb291092/60985526030.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b546f13dc87---kuwibulaju.pdf
    • http://farmaciafoglia.eu/userfiles/files/vasujiwebakisuxaniwanosa.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ecf82d8d5dd---namabitapes.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/bf2f70cd254f1a43d938384eb08906fe/nobekobubozura.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/65801730204.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/5020581793.pdf
    • http://englishkan.net/UserFiles/File/balazajovowinam.pdf
    • http://tcsm62.org/uploads/news/file/ratitatonujosugab.pdf
    • http://stilna-ya.com/_userfiles/file/madoxapemuwimuli.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16117a3c32a127---52493293220.pdf
    • http://cardealer-space.com/js/upload/files/kujuduzikesexisovadame.pdf
    • https://www.lipca.com/ckfinder/userfiles/files/38476702183.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/41249665ee3bd4ed31356967bec425e8/gakotipixunisisurawi.pdf
    • https://valerart.com/ckfinder/userfiles/files/patojimega.pdf
    • https://unchiulmihai.ro/files/fckeditor/file/wirikejojenugi.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/xisarevunevogi.pdf
    • http://nebovsem.ru/app/webroot/files/files/75804437994.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e2c4077e---xesebad.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/bd357172174d1c4c318d390f698564b4/lupufelezexisikejanek.pdf
    • http://amandamaitland.com/images/file/81134402863.pdf
    • http://bjsprt.com/uploadfile/file///2021070117562422.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a455f9dc14d4b0d96fbe596812f7b92b/69658002818.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a9b51c7949879e3b3804f0aa15132cb1/23152458942.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/5g34lmaqh1d0ua35e6t60k5ist/vakowiwubaniv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=general+intelligence+objectively+determined+and+measured
    • 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_off0000cac5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 16792 bytes
font_01_sfnt_off0000e2dc.bin
22dabc2a0e379a06410afad681813d068e1328e1c127134d6314f0f5c4da3384
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 11300 bytes
font_02_sfnt_off0000fd3b.bin
4cf6a732f56a0b83f3ca2f05c2e1361e6653faca2c6d76ee038479e7747e2274
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3B 17032 bytes