Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0f882a0c060a19a…

MALICIOUS

PDF

117.1 KB Created: 2021-07-10 03:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cd0471375f774fb181b31c3f47bf5b8a SHA-1: 72950b25d6e38c1486eea7f8eccd7201463ba03b SHA-256: d0f882a0c060a19a0247eda213c1f505e6e148098195365124c3f54f81546315
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic firings indicate this is a link farm, likely used for SEO poisoning or phishing, and ClamAV detected it as a phishing trojan. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=assassin%27s+creed+2+100+completion+guide
    • http://masan315.net/board/imagefile/file/92540902800.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/lupimebawasomezabu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c121c7d9f37---libojadabokapotokaligi.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8fb27f3c04afddf0ce7c02d5d96066a0/nuregakiwariraxi.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732d6b67a15---jemanatupudomodojibow.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/befbb320d3778e8e049544ca3c0d06d1/9880440288.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/afa75461d7384047afc51a21f583f027/nozakagagiso.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/xosepasux.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/mnmmilhgf6n8amgsqb6u0l3sj0/15938990850.pdf
    • https://protradingindia.net/userfiles/file/83937317031.pdf
    • http://sxhk365.com/uploads/file///gaxoteriru.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/81640750010.pdf
    • http://toshiba-center.ru/uploads/files/ralonaluxodewofelamexaki.pdf
    • http://amandatravel.com/userfiles/file/61606045532.pdf
    • http://ampletrekking.com/userfiles/file/baluviset.pdf
    • http://beepost.vn/upload/userfiles/files/97159679394.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc54b13b4d---talokefunumuxowe.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf16ce207---27257721574.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d283379afe---28964231738.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d02ee7dbc---pufovera.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/dc9c31a731956c47389e6c1b3e596402/kovejuvesejudijapimab.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c77d36326f---4882159557.pdf
    • http://bsa.by/ckfinder/userfiles/files/tikabagukazudulube.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/8t12ib7ftp2ct92jo43nussme7/25384900276.pdf
    • http://irodori.kir.jp/files/file/57556317718.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_off000161ff.bin
be769a0f60260bcfa1012ed37fb06e3b33917149bc4d06346dc77b7a08438fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x161FF 18408 bytes
font_01_sfnt_off00019278.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19278 16792 bytes
font_02_sfnt_off0001aa8f.bin
66f1fc5bfe7cff69e87441045133a0a7d80c6057b75ba17fe930ef21075e775b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA8F 11268 bytes