Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46e38d487104caf…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 03:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 05a4db690a1a0b10eeb29c2484abc47f SHA-1: a42466b2cd54a807c811dd570bee716b7703967a SHA-256: e46e38d487104cafdbc1d5b6652a08f1e1abfe30083dce5bb3a3d15e9377b3d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to distribute further malicious content. Heuristics indicate these links are used to host other PDF files, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://ancheng-medical.com/uploadfile/files/79054104007.pdf In PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614658a94917a---14301140336.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/loxozeberokobekowenigu.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/jivobisenazuzirida.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/41536580284.pdfIn PDF document text
    • http://debten.net/UserFiles/File/saleribanaginefujil.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/35359768254.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/narefirogopul.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/juxovobadifu.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/debogarijefemasaxoxipo.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/gatewanajemifupomo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3998b73845dcce3b8c806f57211a4d88/nevokuwuke.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/25331155316.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210919073236_pysyuo.pdfIn PDF document text
    • https://afma.pt/site/upload/file/68960371164.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ae3d52.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/25631696493.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/65874383238.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/88398277368.pdfIn PDF document text
    • http://capri.lt/userfiles/files/897322068.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391b8561b79---lobelegodomakagigovitazo.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/75764296884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mini+militia+cheat+apk+download+freePDF 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_off0000d537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD537 17720 bytes
SHA-256: 467e333ccb3db2c6eefb31cc1f9a8e13a5f6497c92a39bef619d31a60ea49ec7
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD0 10888 bytes
SHA-256: 441f4103ca2c0cb4efd4d56ba27483d1cead5c9894abdbcdadc434a2e8918930