Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b58e2409d66ca2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-22 16:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a45d67c7f4743a156a3819569edf5d8f SHA-1: 63d3588fd53973fd81e5f223d83046eedc48483f SHA-256: f8b58e2409d66ca2864df8585a61b2b12084fd2b2d4a06de029e6a107110c35d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, indicating a link farm designed to obscure the ultimate destination. The 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic strongly suggests these links point to potentially malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://www.kotolantopeni.cz/files/sekaxiwaroragositejakipu.pdf In PDF document text
    • http://lindendirect.com/tempimg/file/sininomiser.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/fopasi.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/mezejikuzabejex.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/dukepi.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/87487778105.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/sikuvugubujifanuj.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/80778976258.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/10840944557.pdfIn PDF document text
    • http://rld-carbon.ru/file/66483707476.pdfIn PDF document text
    • https://istanajp.net/contents/files/gunomof.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/98850878480.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/39754848349.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/96138857958.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/reduruwesowupafur.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/kogopexitusisuzusuxo.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/55486486022.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/334202626570c8adca6f703ee646a398/bifewugagaperizilotofipu.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/rasadoxeredusufosari.pdfIn PDF document text
    • http://w-mill.jp/images/file/lamomuzorinikilutibu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/todizadebevivi.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/gopibib.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/77439433846.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b8345a26a53c45f167036225212d5bfb/zanazogeju.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/64366368993.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f084c79806---86952248902.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16146188d3dc75---77106781394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=parking+collection+services+pty+ltdPDF 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_off0000c2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10960 bytes
SHA-256: 824c1cf4a1697ddbf5c41039bc7989806a53263f16910e755045a0667d63791f
font_02_sfnt_off0000f450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF450 16216 bytes
SHA-256: ebf36cc18250f60a1dee87c7501dd7b009ce0a20f3c6ec545937030b9efce366