Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b5c66d31f41ddb…

MALICIOUS

PDF

91.9 KB Created: 2021-08-07 06:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 511ee101dc5b2a4238ab28f97112e3c9 SHA-1: dcc86cfdce4288187372c5aee31c43b70b945735 SHA-256: 12b5c66d31f41ddbde656c8816fd3e00f70aa6bd200fbe46e976ad49af714a64
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised websites, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary purpose appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 http://nena-artspace.com/ckfinder/userfiles/files/70920026205.pdf In PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/korurimixu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fac2f77a5f1497f7cebc3cb3a54cb1b6/dumigaxibuvurumarupow.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/omfec518kag0hbcqjdqo8gbnd6/75614328949.pdfIn PDF document text
    • http://tate79.com/clients/868750/File/9063553219.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/95819373762.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d457b58a3e---javup.pdfIn PDF document text
    • http://nutrisoilvietnam.com/upload/files/rejodifuguru.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1abde57994---34200035768.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/b7defc4e7779acff743fd10c1ff8be3e/58272051776.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/83056598969.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/89922329153.pdfIn PDF document text
    • http://teaneckhs1977.com/clients/67867/File/puwiroxelijavawirak.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/27afef2b067406622e3405f8e289761f/tewogewazataniloz.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610913b22d4be---mupixudisuxagewofeweb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b4b83b68---fizimurafepa.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073391d848a3---40661788405.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/57444468624.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user///file/_0389225001627738422.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/80802826995.pdfIn PDF document text
    • https://estoniapools.com/contents//files/41254541796.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/9813942073.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/25167724167.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/15ffce02f19b82e1a1ed367e66eb775b/wudajanunamikujosor.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe32bf3b7fa---ridutewoxixejolas.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/pidunadediba.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdecd83cf83---3316183849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=something+wicked+this+way+comes+pdf+free+downloadPDF link annotation
    • 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_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 11436 bytes
SHA-256: 10b3b0503af467c9c5173770a2bb29f8e447c35725354109bf9463a764a7c7b5
font_01_sfnt_off00011b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 17448 bytes
SHA-256: 6cc3c667ee1b64abaefa41d5c99e05569262515746c7cdf9b8f30dd1bd972fd8