Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc31985758a6c55f…

MALICIOUS

PDF

83.4 KB Created: 2021-07-01 18:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0408a4911aa4562540b3b6ac705c31fd SHA-1: 6a6f317a854effaa06d1e1740c510422546d2652 SHA-256: dc31985758a6c55f802aaf0c93ac1a15674bcc97c5ca924da761da2efa4dbb2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download 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 0.9956

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://crysiq.ru/uplcv?utm_term=oh+lord+heal+our+land
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075104791939---nijosakup.pdf
    • https://pellevah.com/upload/files/67507970346.pdf
    • http://beulahcooleycollection.com/clients/870349/File/zukovetewetaril.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7ce9e02c---56987243467.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/hqgqipga78n0236paofsfe218c/9966313904.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4p58i76ch2t9utbdlor9r4a9cn/tapipizesovida.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81c06adf30---sigituruludupivogegumeza.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021632338515516.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608accacdf407---69516071223.pdf
    • http://sincaremedicaltour.com/js/upload/36472187718.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bbb8a5e8---95531116423.pdf
    • http://enotecagaribaldi.it/userfiles/files/10508109802.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8853610e0973dd2cb49507643369675d/16366299577.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7ec4022b3---dosagexazeruvuzosaxule.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3673e22f98c77b1aae45b1b52d7963ea/22648046636.pdf
    • https://alistairmills.com/ckfinder/userfiles/files/91600656098.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/524e5e2c4289da17f7b7df431e1889f8/40555661359.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce84af3ae1---xuzoxemom.pdf
    • https://transport-vehicules.fr/userfiles/file/80352286436.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ba6435498---86327896120.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/98965658620.pdf
    • https://ntct-dz.com/ckfinder/userfiles/files/tajabun.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2e9bec99e03165cca64e91de754b2dc6/talimipudutubuwirowa.pdf
    • 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_off0000e4a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A5 16792 bytes
font_01_sfnt_off0000fcb7.bin
7707afe9b25fe49c587d4590f5bed1e66ba8abc250e6bc1532ed427214fcecd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 17560 bytes
font_02_sfnt_off00012a31.bin
8954da3d9c66fdaf7203a564618c3cf1f6b39b5f8fff781daed49c22e32f23a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A31 10112 bytes