Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d28f01811726231…

MALICIOUS

PDF

77.7 KB Created: 2021-09-18 21:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5044e27e5220f7d80a9c97181d66aafa SHA-1: 65f39de80a200012ea950ec26795d25b6937a5a1 SHA-256: 6d28f01811726231e19f70cb8f586ce7ed676699b1af6664a8309f1e3fdfb0d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://unsersohn.com/images/file/vagufuwer.pdf In PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/miwalidaxowomabika.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614053c76e976---soxejakesototoxo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/fb5ec86db727ec230a24c59b02556e0a/36071088590.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/703af458afa163a6c051007cd9775d89/27197183363.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/xiwaxovogagur.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/balavasavumum.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/fanigezifenasog.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/43500166055.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/nijunexesagimefijozadag.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/wibogatomovidox.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/21355823325.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef57d127f9---zixurux.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/goluzuwofebe.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/95566098139.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/jegirobagexoregulut.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b79ac50930e9532f57c527de56799ceb/52610122671.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/69461233902.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/83006784695.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/wizasitikip.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nufusexevopikever.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e362c4d91d---vewozuxiwoxujijaremub.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/61876781726.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/bozuxipivepenarozux.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/xazun.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/lrq177t281e4hh0lmopouo8ic4/sizuwubip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=oriya+live+tv+app+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/godiluluvurixanij.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
stream_002_off0000cb19.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCB19 10508 bytes
SHA-256: 0057ebc503610d15f7ebd446d64ef5b1e12baf911b52b77ab55af9621afc2acd
font_01_sfnt_off0000e32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32A 17924 bytes
SHA-256: 9f559c73cfee00495fdf3cd709e2738251278cfb5f5026775721580d76b0711d
font_02_sfnt_off00011139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1