Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02a275f8c2f4bda…

MALICIOUS

PDF

103.5 KB Created: 2021-06-28 12:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dbf474f4d50c3fbfbbb3977d998cac5c SHA-1: 87105a211be08844d8817996de514d0bec5accb6 SHA-256: b02a275f8c2f4bda58136f5ffb367be1816c765de047ce7387d151a85373b681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URIs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=the+meaning+of+hindrance PDF link annotation
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf47af3f2e8---zijaveturo.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/didexukirelag.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/bfieg3mok5knmhhm4n4rmbthb4/39121373033.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809424d36d1---88092343547.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9bb4078171ff34e580be8b6ab8422a8b/53999243232.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/badezatajatofix.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e4af1145---rojakivuvoman.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mqrst5sabvq2jceob5br4t8mce/21841074527.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/beludagegetavedironozimez.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/dumigizatetada.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/sbhhe6p1sn0q3nbqhfunlj9k5p/83333983149.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/gipegedezabopesawoxog.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a187a854---60597922222.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/rubugapidimipamasaj.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/gadobinubotimarizerobe.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80bb4cc2e---66050354098.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/22d78ebe8606eea1611860e3dd88c3e6/xuzufexililepixalebev.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/votogemonixumosunor.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac8913b228---69558411803.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/80796669181.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/9b72d99f5e054f290a3f2260a4a70c6b/85598584908.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a99230ade7---tikojexexiluxekunakijof.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/fa34bb61db74a5c118107a7b0001ad32/83644993638.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/m8j4l9pbgam9ljd7jf2lroltvi/buxalegilu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13186 18460 bytes
SHA-256: 54a36881c0a3ee521c379cc071aa35db3b5cceb66ad3c1362d3eb91c43c34e30
font_01_sfnt_off0001610e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1610E 10572 bytes
SHA-256: ea54e5706775229a8f37ecd05fe3a4000fecbacf73ae85fe3c5918d4d419467b
font_02_sfnt_off000178b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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