Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93ab92206ee811b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 12:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b432e58c4b012496834e9fe77ac15a56 SHA-1: d89214a33a752f34e9da719bdb466709128cc3f2 SHA-256: a93ab92206ee811b5d0b307f04c3ce744470bb7b89ca64fdee9f6cf9de4f515e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique similar to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/bee316e3ab5eb51485ae747cb15b301c/57600811326.pdf In PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4eeeb0ae---mefizilofutenibawewiz.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/38161735311.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/30743775239.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/peruxukanetofupu.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/wigorumodepo.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/eed8251015a1f0e073737af2c6863c8f/lagutuzomubokakolezi.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34493d6750---96352220664.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b990961f25e---zukelek.pdfIn PDF document text
    • http://bougerpourstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/dobazapolejudubixuri.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ed98c692f852e42b7771ee3515be69ee/47180872116.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/voxebofenuk.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b035647b9a---dimumupopiva.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kagijakufidezivamajuzuw.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/vinadomewefiwufolu.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3du2g5tqg2v0s3ood5rhr1tq6h/50490458291.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2ae25b909---60919737734.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210802184726.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/xanopapipanefejirafagut.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/t5t84coc32gnu1msvoodldpvm2/95158886636.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609814d30f6cb---kulidekegetipajeganego.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/bolamomasibotu.pdfIn PDF document text
    • https://alula.com/wp-content/plugins/super-forms/uploads/php/files/fbc8ca9a0029602aaac0a8c8cc7cbe70/divegixixibu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/07bd4ea9b9b65439652ae74254fd0760/dajokufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=college+inventory+management+system+project+report+pdfPDF 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_off0000dbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 17448 bytes
SHA-256: cd895297d6fc7e970eff7034f6c66aedd455c434234cb8efe9894cc6b8dd7938
font_02_sfnt_off000120b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B5 11304 bytes
SHA-256: 85944c2d104a21522c05c5d2273a921b395f1315d9bf1c6e2c0e615b354624dc