Malicious PDF — malware analysis report

Static analysis result for SHA-256 432175344d8d5d99…

MALICIOUS

PDF

70.0 KB Created: 2021-09-03 13:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d9365cd0f3bf1d837e32f27e6713f60 SHA-1: b6a681e460c8561262fc47b9466dd1363d023987 SHA-256: 432175344d8d5d993c8f080ece7e4fd77c7625ddc5d4f12bb59811fa76c8f3f4
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF functions as a link farm, with numerous embedded URLs pointing to compromised websites and potentially malicious PDF files. These links are likely intended to lure users into downloading further malware or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/743f5d2c94ead95d4dbcf65d7dd2cb01/kofapamagologu.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s3483h1ldtbvj35be310huces5/negimipuxavofufizuride.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ebba5ba8---dojobetogefigonad.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/udgoqgr8pkbfjsdhhhgcd26sj2/bafowonivaligesokili.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://emeat.ru/var/files/88180062249.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/vadamesebasebaw.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/gunukose.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/84aa8c2b8fbea7b2134a2c2d048b584d/75223740731.pdfIn PDF document text
    • https://sealskinz.ru/files/file/96108778741.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd33a1309f---58179678485.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/pabosupoziz.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099be7c96d84---nakanozumakitobuwaxo.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160db90e309fba---rozuxugawajurorojiwirita.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/dovodakexivajenefifem.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b7109b3f7---82613676972.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/79477700326.pdfIn PDF document text
    • https://stopserv.ru/files/file/taparezoxagota.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f18345e94---kavumipizesulon.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fuzikakapuli.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093a78c5f52f---71315295373.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hampton+bay+ceiling+fan+parts+manualPDF 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_off0000b1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D4 15628 bytes
SHA-256: c8155b7795aa842380db678e409e222017167e1430967d9d6edc830a40e9a26a
font_01_sfnt_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 11168 bytes
SHA-256: 4995e545b364a6b71a83570648aac87d756a97e24fa76f60ff47af5b8500a7e1

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